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Reply To: Amount of GPRSusers per sector in alcate

#65262
pix
Guest

hi pawa,

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1/ in edit cell in OMC-r i can see the following parametrs:
MAX_PDCH_PER_TBF = 5 – it means (as i understand) that one user theoretically can occupy 5 time-slot. is it correct? but as far as i know there are no MS that can do that – max numb 4?
will some change if we set MAX_PDCH_PER_TBF = 4 instead of 5?
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some MS (class 30 to 34) can support up to 5 timeslots in DL. Your interpretation of this parameter is correct.

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i found out 2 parameters in OMC_R related (possibly) to supervising amount TBF per PDCH – seprate for UL and DL. am i on the right path?
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yes

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MAX_UL_TBF_SPDCH = 5 – it means that in UL we can share one PDCH (as i heard in B10 we have only SPDCH, no MPDCH) between 5 users. is it correct?
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yes

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MAX_DL_TBF_SPDCH = 8 and this means that in DL we can share one PDCH between 8 users. is it correct?
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yes

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what do you think about such values?
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those values tend to maximize the number of users per cell, but at the expense of the throughpupt per user. It is a safe choice.
Reduce this value to provide more throughput per user, but then you might see a higher TBF congestion.
you could try to perform such optimization, step by step, to find the best compromise :
MAX_DL_TBF_SPDCH = 8 –> 6 –> -> 4

Major parameters in GPRS are:
max pdch
max pdch high load
min pdch

They must be chosen carefully depending on the number of TRX in your cell.

Cheers
pix