How to check Packet Loss and Latency?
Troubleshoot the latency or packet loss issue by checking the multi interface from Node to Node ,to identify the NE Interface problem.
Below picture shows Latency Troubleshoot Flow in 5G NR.
Below are steps to check packet loss and latency in 5G NR.
Step 1: Analyze the delay between any 2 points/Nodes.
Step 2: If the delay is normal, then analyze the next segment.
Step 3: If the delay is abnormal, check the related NEs / Transports.
Step 4: Check the delay for each TCP link setup phase and RTT delay of UL/ DL data transmit.
Below picture shows Packet Loss Troubleshoot Flow.
If the packet loss rate of 1,2,3 is different, analyze if the loss rate of the Tx path is greater or smaller than the previous loss rate to identify the issue NEs.
Packet loss and latency in 5G networks can be caused by issues in the radio interface, core network, or external factors like server congestion. To optimize performance, key areas to analyze include scheduling delays, retransmissions (HARQ, ARQ), buffer overflow, and network congestion.
High BLER or low MCS can indicate interference or weak signal conditions, while core network latency can result from improper QoS settings or congestion. Troubleshooting involves monitoring KPI trends, analyzing logs for retransmission patterns, and optimizing scheduling, resource allocation, and transport configurations.