Parameter Name |
PI |
|---|---|
Description |
Cell Reselect Parameters Indication (PI for short), sent on the broadcast channel, indicates whether CRO, TO, and PT are used. Actually, the MS is informed whether C2-based cell reselection is performed. For details, see GSM Rec. 0408 and 0508.In addition, a least interval of 5s is required for C2-based cell reselection to avoid frequent cell reselection. When PI is set to 1, the MS obtains the value of C2 based on the broadcast system information and determines whether a cell is reselected. When PI is set to 0, that is, C2 equals C1, the MS determines whether a cell is reselected based on the value of C1. |
GUI Value Range |
[No,Yes] |
Default Value |
Yes |
Unit |
None |
Step |
- |
Modification Rules |
None |
Configuration Policy |
The MS obtains C1 and C2 of the serving cell at a minimum interval of 5s. When necessary, the MS re-calculates C1 and C2 value of all non-serving cells (adjacent cells). The MS constantly checks whether a cell reselection is required by referring to following conditions: Whether the path loss (C1) of the current serving cell drops below 0 within 5s.If yes, the path loss is too large. C2 of an appropriate non-serving cell exceeds that of the serving cell in 5s and the following conditions are met: ? The C2 of a new cell in another LAC minus CRH (broadcast in the system information 3 and 4 of the serving cell) exceeds C2 of the serving cell in 5s. A cell reselection is performed in the last 15s, and the C2 of the new cell minus 5 dB constantly exceeds the C2 of the serving cell in 5s. A better cell exists if the above conditions are met.If a better cell exists, the MS reselects a cell,and does not go to the previous cell within 5s. |
Recommended Value |
Yes |
Parameter Relationship |
None |
BSC Feature |
None |
Parameter Class |
Parameters About Radio Resources |
Caution |
None |