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
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
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
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),
C2GSM = RX levelGSM + 102 + 0
C2DCS = RX levelDCS + 99 + 16
C2GSM = RX levelGSM + 102
C2DCS = RX levelDCS + 115
C2target > C2serving (for 5 seconds)
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If both cells are GSM cells (Cell A & Cell B)
C2A > C2B (for 5 seconds) to reselect to Cell A
RX levelA + 102 > RX levelB + 102
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.
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If one cell is GSM & other is DCS, find the requirement to reselect to DCS cell.
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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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...
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