KPIs are the important performance parameters that are required to troubleshoot and optimize the LTE network and check the performance of the most essential network functions.

• Summary Report: Select the time range, venue and APs from the respective drop-down and click Apply to view the following System KPI reports:
  • RRC Connection Establishment Success Rate: The Radio Resource Control (RRC) protocol connects UE/Clients (CBRS compliant LTE device such as a dongle or a phone) with LTE AP. A RRC connection is successful when an UE performs the call establishment procedure, and get resources from the LTE AP. The connection success rate is displayed as a percentage, computing the successful connections against total connection attempts. An acceptable success rate percentage is displayed in green color and a poor success rate is displayed in red.
  • RRC Connection Reestablishment Success Rate: The re-establishment procedure is required in order to re-establish the lost RRC connection. This procedure is successful only when LTE AP has a valid UE context. A re-establishment is initiated upon detecting radio link failure, handover failure, mobility failure, integrity check failure and when there is a RRC connection reconfiguration failure. The connection re-establishment success rate is displayed as a percentage, computing the successful re-connections against total re-connection attempts. An acceptable success rate percentage is displayed in green color and a poor success rate is displayed in red.
  • Initial E-RAB Setup Success Rate: After the UE sends the RRC setup complete message to the LTE AP, the LTE AP sends an initial UE message to the MME indicating that the purpose of the UE and its credentials. When the MME receives this message and it decides that a bearer is required, it sends an initial Context setup request to the LTE AP. This message is considered as the initial EPS Radio Access Bearer (E-RAB) attempt, as it contains the bearers to be added.

    The initial connection setup success rate is displayed as a percentage, computing the successful connections against total connection attempts. An acceptable success rate percentage is displayed in green color and a poor success rate is displayed in red.

  • Additional E-RAB Setup Success Rate : The additional E-RAB success rate is displayed as a percentage, computing the successful additional connections against total connections.
  • Handover Success Rate: This KPI is used to measure the performance of network when handling the movement of users and still retain the service for the user. When the source LTE AP sends RRC connection reconfiguration message to the UE, an inter LTE AP hand over is done. The number of the attempted handover is calculated at the source cell. The hand over success rate is displayed as a percentage, computing the successful handover against total handover attempts. An acceptable success rate percentage is displayed in green and a poor success rate is displayed in red.
  • Dropped Call Rate (DCR): DCR in LTE network is a scenario when a user’s ongoing session is dropped, terminated abruptly, and unintentionally, requiring the user to initiate a new connection to resume services. At the LTE AP level, this is considered as an abnormal release which can be verified from the error code inside the Context Release message. The DCR is displayed as a percentage, computing the number of dropped calls against total calls handled. An acceptable DCR percentage is displayed in green color and a poor rate is displayed in red.
  • SAS Availability: For LTE APs to remain in the transmitting state, a valid grant from SAS is mandatory. Each AP is constantly communicating with SAS via the heartbeat mechanism. Therefore, it is critical that the SAS connection with LTE AP is always available. For any SAS outages, a counter is maintained to record the percentage of time for which SAS is available to track LTE AP service availability.
  • Cell Availability: Each LTE AP is referred to a Cell as per LTE protocol terminology. Each Cell is considered as available when an LTE AP can provide the E-RAB service in the cell. This KPI is calculated as the percentage of time that the cell is considered available against the total measurement time. A healthy percentage is displayed in green, and a poor percentage is displayed in red.
• Throughput statistics: The following KPIs measures various data traffic statistics in terms of throughput (Mbps) and volume (GBytes) for the Down Link (DL) and the Up Link (UP) direction.
  • Average DL throughput (Mbps):This KPI measures the average rate at which data is transferred from the LTE AP to the UE, within a selected reporting interval.
  • Average UL throughput (Mbps): This KPI measures the average rate at which data is transferred from the UE to LTE AP, within a selected reporting interval.
  • DL traffic volume (GBytes): This KPI measures the total amount of data transferred from LTE AP to the UE
  • UL traffic volume (GBytes): This PKI measures the total amount of data transferred from the UE to LTE AP.
• GPS statistics:
  • GPS Availability: This KPI measures the availability GPS measurements only for LTE APs within a venue that are configured to sync up with GPS satellites. The GPS availability is measured in percentage of time within the selected reporting interval.
  • Phase Locked: This KPI indicates the average percentage of time LTE APs within a Venue remained in the phase-locked state with timing source. This KPI is measured in percentage of time within the selected reporting interval.
  • Holdover: This KPI indicates the average percentage of time LTE APs within a Venue were degraded to holdover phase because of unavailability of a reliable timing information from their timing source. This KPI is measured in percentage of time within the selected reporting interval.
  • Frequency Phase Recovery:This KPI indicates the average percentage of time all GPS capable LTE APs within a Venue were in frequency recovery phase. This KPI is measured in percentage of time within the selected reporting interval.
• Stats per LTE AP: Click the Stats per LTE AP to view the KPIs pertaining to each configured LTE AP, in a tabular format. The data is presented per Access Point.

All of the per Venue KPIs are also available for each LTE AP.