4G Strategy: MRO (Mobility Robustness Optimization)

Fact Finding:

Due to the more easy HO triggered parameter configuration, slow speed UE locating HO area will generate ping pong handover.

Pro :

 To reduce PingPongHo number.

Cons :

Almost no impact

Background:

ØPing Pong UE Identification:

consecutive ping pong handover between source cell and target  cell occurs and the consecutive ping pong HO times are great than UePingPongNumThd  and average staying time in ping pong target cell is less than PingpongTimeThd

ØAutomatically perform handover parameter (CIO-1/CIO-2) to avoid PingPongho, No impact to normal subscriber.

Analysis:

MRO is used for self-optimization in an SON. MRO collects handover performance statistics for different scenarios, identifies abnormal handover scenarios, and optimizes the handover-related parameter settings.

Parameter Setting :

Step 1: Modify Ping-pong handover threshold (7 days before step 2)

Parameter Name	MO	Parameter ID	Before	After
Pingpong handover threshold	MRO	PingpongTimeThd	1	2
UE PingPong Number Threshold	MRO	UePingPongNumThd	5	2

Step 2: Enable UE Level MRO

Parameter Name	MO	Parameter ID	Before	After
MRO algorithm switch	ENodeBAlgoSwitch	MroSwitch	UeMroAlgoSwitch:Off	UeMroAlgoSwitch:On