Intra-Frequency Handover Out Success Rate -- LTE

Intra-Frequency Handover Out Success Rate

Description

The Intra-Frequency Handover Out Success Rate KPI indicates the success rate of intra-frequency handovers (HOs) from the local cell to neighboring E-UTRAN cells. The intra-frequency HOs are classified into intra- and inter-eNodeB HOs.

Intra-eNodeB Outgoing HO

Intra-eNodeB outgoing HOs can be further classified into HO with RRC connection reestablishment and HO without RRC connection reestablishment.

• Intra-eNodeB outgoing HO without RRC connection reestablishment
  Figure 1 illustrates an intra-eNodeB outgoing HO without RRC connection reestablishment, and the source and target cells operate at the same frequency. When the eNodeB sends an RRC Connection Reconfiguration message containing the handover command to the UE, the eNodeB counts the number of intra-eNodeB intra-frequency HO outgoing execution attempts in the source cell at point B. When the eNodeB receives an RRC Connection Reconfiguration Complete message from the UE, the eNodeB counts the number of successful intra-eNodeB intra-frequency outgoing HO executions in the source cell at point C. 
  Figure 1 Intra-eNodeB outgoing HO without RRC connection reestablishment
• Intra-eNodeB outgoing HO with RRC connection reestablishment
  Figure 2 illustrates an intra-eNodeB outgoing HO with RRC connection reestablishment, and the source and target cells operate at the same frequency. When the eNodeB sends an RRC Connection Reconfiguration message containing the handover command to the UE, the eNodeB counts the number of intra-eNodeB intra-frequency outgoing HO execution attempts in the source cell at point B. When the eNodeB receives an RRC Connection Reestablishment Complete message from the UE, the eNodeB counts the number of successful intra-eNodeB intra-frequency outgoing HO executions in the source cell at point C.

  Figure 2 Intra-eNodeB outgoing HO with RRC connection reestablishment

Inter-eNodeB Outgoing HO

Inter-eNodeB outgoing HOs can be further classified into HO without RRC connection reestablishment, HO with RRC connection reestablishment to the target cell, and HO with RRC connection reestablishment to the source cell.

• Inter-eNodeB outgoing HO without RRC connection reestablishment
  Figure 3 and Figure 4 illustrate X2- and S1-based outgoing HOs without RRC connection reestablishment, respectively, and the source cell and target cell operate on the same frequency. When the source eNodeB sends an RRC Connection Reconfiguration message containing the handover command to the UE, the source eNodeB counts the number of intra-frequency outgoing HO execution attempts in the source cell at point B. When the source eNodeB receives a UE Context Release message from the target eNodeB or receives a UE Context Release Command message from the MME, indicating that the UE successfully accesses the target cell, the source eNodeB counts the number of successful intra-frequency outgoing HO executions in the source cell at point C. 
   
• Inter-eNodeB outgoing HO with RRC connection reestablishment to the target cell
  Figure 5 and Figure 6 illustrate X2- and S1-based outgoing HOs with RRC connection reestablishment to the target cell, respectively, and the source cell and target cell operate on the same frequency. When the source eNodeB sends an RRC Connection Reconfiguration message containing the handover command to the UE, the source eNodeB counts the number of intra-frequency outgoing HO execution attempts in the source cell at point B. When the source eNodeB receives a UE Context Release message from the target eNodeB or receives a UE Context Release Command message from the MME, indicating that the UE successfully accesses the target cell, the source eNodeB counts the number of successful intra-frequency HO executions in the source cell at point C. 
   
• Inter-eNodeB outgoing HO with RRC connection reestablishment to the source cell
  Figure 7 and Figure 8 illustrate X2- and S1-based outgoing HOs with RRC connection reestablishment to the source cell, respectively, and the source cell and target cell operate on the same frequency. When the source eNodeB sends an RRC Connection Reconfiguration message containing the handover command to the UE, the source eNodeB counts the number of intra-frequency outgoing HO execution attempts in the source cell at point B. When the source eNodeB receives an RRC Connection Reestablishment Complete message from the UE, the source eNodeB counts the number of successful intra-frequency outgoing HO executions in the source cell at point C. 
   

Definition

The Intra-Frequency Handover Out Success Rate KPI is defined in Table 1. Note that the number of outgoing HO execution attempts and the number of successful outgoing HO executions are collected based on the description in Description.

Table 1 Intra-Frequency Handover Out Success Rate

Name	Intra-Frequency Handover Out Success Rate
Object	Cell or radio network
Formula	IntraFreqHOOut_SR = (IntraFreqHOOutSuccess/IntraFreqHOOutAttempt) x 100%
Associated Counters	Intra-Frequency Handover Out Success Rate = [(L.HHO.IntraeNB.IntraFreq.ExecSuccOut + L.HHO.IntereNB.IntraFreq.ExecSuccOut)/(L.HHO.IntraeNB.IntraFreq.ExecAttOut + L.HHO.IntereNB.IntraFreq.ExecAttOut)] x 100%
Unit	Percentage (%)
Note	None