# Mobile Communication Basics - Cell Reselection Parameters

Updated on June 20, 2010

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.

## Buy Best RF Optimization Books

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

## Location Update

Why location updates? Network has to identify where is the mobile is located to page it when an incoming call is received. Why cannot page the entire network? Millions of calls receive every moment, the...

## How to improve Hand Over Success Rate

It is very important to maintain correct neighbour plan and do the basics. If you do not follow the basics of neighbour planning, it is very limited to possibilities to improve HOSR by using parameters. Edge,..

## External Cell Parameters

It is required to define correct data in external cells to have a proper inter-BSC handovers &amp; inter-MSC handovers, especially values of Layer, Layer Threshold and Minimum DL Power of the candidate cell. This...

## 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...

## Popular

0

23

• ### Fix New Emails Not Showing on Android Cell Phone Mail App

13

0 of 8192 characters used

• Onigece

5 years ago

Useful!

• Amos Neneje

7 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.

working