Random Access Channel Metrics

A Random Access Channel (RACH) is a shared channel used by User Equipment (UE) to access the mobile network for call set up and bursty data transmission. Whenever a mobile makes a Mobile Originating (MO) call, it schedules the RACH. RACH is a transport layer channel, and the corresponding physical layer channel is Physical Random Access Channel (PRACH).

Example of sample RACH metrics.

{
    "type": "Kafka-Collector",
    "instance": "KC-1",
    "timestamp": "2021-11-11T23:04:24.044000Z",
    "metricType": "RACH",
    "domain": "5G",
    "sub-domain": "vRAN",
    "properties": {
      "dataSource": "100.126.144.164:9999",
      "deviceType": "du",
      "deviceName": "du-851008008",
      "entityType": "du",
      "entityName": "du-6cdcbd97b5-8rrpt"
    },
    "metrics": {
      "OR_RACH_NumRxDedicatedPreamble_SSBBeam": 10,
      "OR_RACH_RxPreamblesGroupA_SSBBeam": 0,
      "OR_RACH_TxRarDedicatedPreamble_SSBBeam": 0,
      "OR_RACH_TxRarPreambleGroupA_SSBBeam": 0
    },
    "tags": {
      "CUCPID": "851008000",
      "RUID": "851008213",
      "DUID": "851008008",
      "CellClusterId": "111",
      "kubernetes_namespace": "sdlas00082b-ns-mv-du-851008-001"
    }
  },

The following table lists the JSON definitions.

JSON	Description	Units
OR_RACH_NumRxDedicatedPreamble_SSBBeam	Indicates the Random Access Preambles per SSB for the dedicated group.	Integer
OR_RACH_RxPreamblesGroupA_SSBBeam	Indicates the Random Access Preambles per SSB for the received group.	Integer
OR_RACH_TxRarDedicatedPreamble_SSBBeam	Indicates the number of dedicated RACH Preambles sent by the UE.	Integer
OR_RACH_TxRarPreambleGroupA_SSBBeam	Indicates the number of group A RACH Preambles sent by the UE.	Integer