Mobile Communication Basics - Cell Reselection Parameters

C1 = RX level – RX Level Access Min + Power Offset – Max [(MS_TX_PWR_MAX_CCH - P), 0]

Following parameter settings for our network,

  • Power Offset = 0
  • MS_TX_PWR_MAX_CCH = 33 dBm
  • RX Level Access Min = -102 dBm

For GSM900 mobile P = 33 dBm

Then,

C1GSM = RX level GSM – (-102) + 0 – Max [ (33 – 33),0]

C1GSM = RX level GSM + 102 + 0 – Max [0,0]

C1GSM = RX level GSM + 102

For GSM 1800 mobile P = 30 dBm

Then,

C1DCS = RX level DCS – (-102) + 0 – Max [33-30,0]

C1 DCS = RX level DCS + 102 – Max [3,0]

C1 DCS = RX level DCS + 102 – 3

C1 DCS = RX level DCS + 99

C2 = C1+ CRO – TO* H (PT-T)

According to Huawei default parameter settings,

· TO = 0

· PT = 0

Then,

C2 = C1 + CRO

C2 GSM = RX level GSM + 102 + CRO

C2 DCS = RX level DCS + 99 + CRO

According to our network settings,

CRODCS = 8 (16dB), CROGSM = 0 (0dB),

Then,

C2GSM = RX levelGSM + 102 + 0

C2DCS = RX levelDCS + 99 + 16

C2GSM = RX levelGSM + 102

C2DCS = RX levelDCS + 115

For reselection,

C2target > C2serving (for 5 seconds)

Some examples:

Example1:

If both cells are GSM cells (Cell A & Cell B)

Then,

C2A > C2B (for 5 seconds) to reselect to Cell A

RX levelA + 102 > RX levelB + 102

Which means,

RX levelA > RX levelB (for 5 seconds) is enough for a cell reselection

If both cells are DCS, then it is same as 2 GSM cells.

Example2:

If one cell is GSM & other is DCS, find the requirement to reselect to DCS cell.

Then,

C2DCS > C2GSM  (for 5 seconds) to reselect to Cell A

RX levelDCS + 115 >  RX levelGSM + 102

RX levelDCS >  RX levelGSM + 102 – 115

RX levelDCS >  RX levelGSM – 13

Which means RX levelDCS >  RX levelGSM – 13  (for 5 seconds) is enough for a cell reselection to DCS Cell

If RX levelGSM = -80 dBm, then RX levelDCS >  RX levelGSM – 13

RX levelDCS > -80  – 13

RX levelDCS > -93 dBm

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Please leave a comment before go-away... 2 comments

Amos Neneje 5 years ago

I find this place useful for reviewing Celullar Communications basics, which we sometimes forget in terms of theory when the jobs get too monotonous.. By the way I work as a Radio Planning and Optimization Engineer.


Onigece 3 years ago

Useful!

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