Cell Reselection:

Cell reselection for cells in same location area If the C2 value of the target cell is higher than that of the serving cell and

last for longer than 5 seconds, a cell reselection process will be performed and the MS tunes to the new cell.

Cell reselection for cells in different location areas If the C2 value of the target cell is higher than that of the serving cell by at

least the value of CRH and last for longer than 5 seconds, a location updating process and the cell reselection process will be performed.

Cell reselections caused by C2 have a time interval of 15 seconds If current serving cell is prohibited, or down link fails or C1 is less than 0

continuously for 5s, cell reselection will also be triggered.

C2=C1+CRO-TO*H (PT-T) When PT is not equal to 31:C2=C1-CRO When PT is equal to 31.

Wherein:

1. Function H(x) =0, when x<0; H(x) =1, when x>0.2. T is a timer with initial value 0. When a certain cell becomes of one of the six neighbor cells with highest signal level, T corresponding to this cell begins to count with accuracy of one TDMA frame (about 4.62ms). When it is out of the six strongest neighbor cells, the corresponding timer is reset. 3. CRO is used for manually correct the cell reselection parameter C2.4. The function of TO is to reduce the value of C2 from the time when timer begins to count to the time when the value of timer reaches the stipulated PENALTY_TIME.5. PT is the time TO acts on C2. But PT=31 is reserved as the symbol to change the CRO’s effect on C2.

CRO Value range: 0~63, the corresponding level value: 0~126dB, stepped every 2dB. Unit: None Content: Cell Reselect Offset. It is a parameter in C2 calculation to give a manual

modification in MS cell reselection. Recommendation: 0

TO Value range: 0~7 , the corresponding value is 0~60dB, 7 corresponds to “Infinite” Unit: None Content: Cell Reselect Temporary Offset. It is a parameter in C2 criterion to give

a temporary modification within PT time. Recommendation: 0

PT Value range: 0~31, the corresponding time is 20~620s. 31 is to change the

function direction of CRO on C2. Unit: None Content: Cell Reselect Penalty Time. Recommendation: 0

CRH Value range: 0~14 , the step size is 2 Unit: dB Content: Cell Reselection Hysteresis. It is the parameter used when cell

reselection happens between two location areas. Recommendation: 4