What is the criteria for theshXlow and threshXhigh change of values by SON?

4G LTE
, ,
1

Hi LTE Experts.

What is the criteria for theshXlow and threshXhigh change of values by SON?

Admin note: this post was updated with image below.

What is the criteria for theshXlow and threshXhigh change of values
What is the criteria for theshXlow and threshXhigh change of values708×519 11.2 KB

2

It should be for Load Balancing between LTE carriers in idle mode.

3

Ok, any idea on what is the usual criteria for this?
Like SON checks what stats to decide on this switching?

4

Load for example: PRB utilisation, number of users.
PUCCH resources also, number of RRC users.
SRS resources also.

5

Son work in idle mode as well.
Interesting functionality. Which vendor?

6

Hello Experts.

What is the maximum recommended value of threshxhigh and threshxlow in LTE?

7

Here are some examples:

bcch-dl-sch
 message -> c1 -> systemInformation
  criticalExtensions -> systemInformation-r8
   sib-TypeAndInfo
    [0] -> sib5
     interFreqCarrierFreqList
      [0]
       dl-CarrierFreq : 9310
       q-RxLevMin : -61
       t-ReselectionEUTRA : 2
       threshX-High : 3
       threshX-Low : 2
       allowedMeasBandwidth : mbw50
       presenceAntennaPort1 : false
       cellReselectionPriority : 4
       neighCellConfig
        neighCellConfig : The MBSFN subframe allocations of all neighbour cells are identical to or subsets of that in the serving cell
      [1]
       dl-CarrierFreq : 1300
       q-RxLevMin : -64
       t-ReselectionEUTRA : 2
       threshX-High : 5
       threshX-Low : 4
       allowedMeasBandwidth : mbw100
       presenceAntennaPort1 : false
       cellReselectionPriority : 6
       neighCellConfig
        neighCellConfig : The MBSFN subframe allocations of all neighbour cells are identical to or subsets of that in the serving cell
      [2]
       dl-CarrierFreq : 6400
       q-RxLevMin : -61
       t-ReselectionEUTRA : 2
       threshX-High : 0
       threshX-Low : 2
       allowedMeasBandwidth : mbw50
       presenceAntennaPort1 : false
       cellReselectionPriority : 4
       neighCellConfig
        neighCellConfig : The MBSFN subframe allocations of all neighbour cells are identical to or subsets of that in the serving cell
      [3]
       dl-CarrierFreq : 3000
       q-RxLevMin : -64
       t-ReselectionEUTRA : 2
       threshX-High : 8
       threshX-Low : 4
       allowedMeasBandwidth : mbw100
       presenceAntennaPort1 : false
       cellReselectionPriority : 6
       neighCellConfig
        neighCellConfig : The MBSFN subframe allocations of all neighbour cells are identical to or subsets of that in the serving cell

Depends on layer in SIB5 and mobility strategy.

8

What if thresholds are too aggressive like above 15 dB?

How does it affect UE performance?

9

It will make reselection easier to higher or lower priority layers.