4G cell selection reselection

4G LTE
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1

In LTE what is the criteria for cell selection reselection from 4G cell to 4G cell & 4G cell to 2G cell and vice versa?

RSRP/RSRQ?

2

It is based on your network setting
Based on triggering setting
You can check it ,mainly should be RSRP
Because RSRQ dependent on user load and impacted but you can try it as trial as well .

3

Intra-Frequency reselection will be triggered when UE moves out of the serving cell coverage area defined by 2QRxLevMin + 2SIntraSearch.
UE will camp on the neighboring Intra-Freq cell whose RSRP is better than serving cell.
reslection to the GU is depend on QRXLEV - Priority of the layers as well as other parameter like Threshxlow,SNonintrasearch ,…

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4

HI Cell Reselection criteria for 4G is mainly based on below Parameter and Defined thresholds & Priority of serving/NBR Cell.

Parameters related to Cell Reselection

These parameters are defined in 36.304 5.2.4.7 Cell reselection parameters in system information broadcasts. Some of the important parameters and descriptions are as follows :

1)ThreshXHighP : The threshold of target cell Srxlev to perfrom reselection from a low priority to a high priority cell. (i.e, a large ThreshXHigh value makes reselection harder)-Usually Set to 10 Value of 10 indicates=10*2=20 dB

2)ThreshXLowP : The threshold of target cell Srxlev to perfrom reselection from a high priority to a low priority cell. (i.e, a large ThreshXLow value makes reselection harder)-
Set to 10*2=20

3)SIntraSearchP : The threshold of current cell Srxlev to perform intra-frequency. If the current cell Srxleve is lower than this value, UE perform measurement for intra-frequency.

Set to 31*2=62 dB

4)SnonIntraSearchP : The threshold of current cell Srxlev to perform inter-frequency or interRAT measurement. If the current cell Srxleve is lower than this value, UE perform measurement for inter-frequency or interRAT cells.

Set to 12*2=24

  1. Thres_Serving_Low: This parameter specifies the threshold (in dB) used by the UE on the serving cell when reselecting a lower priority RAT/ frequency. : This parameter specifies the threshold (in dB) for intra-frequency measurements.
    Usually set to 10*2=20 db

for reselecting Lower Priority Frequency/RAT both ThresxLow and Thres_Serving_ Low criteria should meet.

Thanks
Govind Dahiya

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