LTE UE Connection Status

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This page documents the enb uepool chans command, by revision, most recent first.

The enb uepool chans command gives a short summary of recent performance for all active LTE radio connections.


As of r7437

  • RNTI - RNTI (radio layer connection ID) of this connection.
    • If this number is followed by R, it means the connection is marked for release but not yet fully released.
    • If this number is followed by S, that means it is a simulated UE generated internally by the eNodeB.
  • PHR - Power headroom in dB per resource block.
  • RSSIdB - Recent average PUSCH UL RSSI, referenced to the receiver saturation point.
  • RSSIdB - Recent average PUSCH UL RSSI in true dBm.
  • UL-SNR - Short-term average PUSCH UL signal to noise ratio in dB, which should be 12 or higher for a good connection.
  • UL-FER - Short-term UL transport block error rate ("frame error rate"), before counting effects of HARQ retries.
  • UL-HFER - Long-term UL transport block error rate, including effects of HARQ retransmission and recovery.
  • UL-eff - UL PHY efficiency in bits per resource element x100.
  • 64QAM - True if 64-QAM is enabled for UL.
  • ULbytes - Total number of bytes transferred on UL at the MAC layer, including padding bytes.
  • DL-eff - DL PHY efficiency in bits per resource element x100.
  • 256QAM - True if 256-QAM is enabled for DL.
  • DLbytes - Total number of DL bytes transferred in the MAC layer on this connection.
  • DL-NACK - Short-term average HARQ NACK rate for DL. An estimate of DL PHY frame error rate at the UE.
  • UC-RSSI - PUCCH RSSI in dB, on same scale as PUSCH. PUCCH is normally 6 to 20 dB lower than PUSCH.
  • UC-SNR - PUCCH post-despread signal to noise ratio in dB, which should be 6 or higher for a good connection.
  • UC-miss - Fraction of time when PUCCH expected to receive HARQ ACK/NACK or CSI but could not decode anything.
    • Shows (inverted) reliability of PUCCH, with zero being ideal.
  • Age - Age of the connection in seconds.
  • Idle - Idle time of the connection in seconds.
  • RSRP - Received power of the DL reference signals at the UE, in dBm per resource element.
    • For a Lab Kit, -70 to -90 is normal, less than < -90 is weak.
    • This level is 20-30 dB lower than the available full-power output of the eNodeB.
  • RSRQ - DL channel quality at the UE. 0 is perfect, -1 .. -3 is good, less than -5 is poor. This number is a good predictor of DL throughput for this UE.
  • UL-BSR - Estimated number of bytes waiting for UL transmission in the UE.
  • DL-BSR - Number of bytes waiting for DL transmission in the eNodeB.

Example:

RNTI    PHR     RSSIdB  RSSIdBm UL-SNR  UL-FER  UL-HFER UL-eff  64QAM   ULbytes DL-eff  256QAM  DLbytes DL-NACK UC-RSSI UC-SNR  UC-miss Age     Idle    RSRP    RSRQ    UL-BSR  DL-BSR
61      30      -12     -32     20      2%      2%      15      false   2962    21      false   5314    0%      -26     43      0%      5       0       -100    -3      0       0

As of r7293

  • RNTI - RNTI (radio layer connection ID) of this connection.
    • If this number is followed by R, it means the connection is marked for release but not yet fully released.
    • If this number is followed by S, that means it is a simulated UE generated internally by the eNodeB.
  • AVGRSSI - Recent average PUSCH UL RSSI, referenced to a ideal level of 0 dB.
  • CURRSSI - RSSI of most recent PUSCH UL transmission, referenced to a ideal level of 0 dB.
  • UL-SNR - Short-term average PUSCH UL signal to noise ratio in dB, which should be 12 or higher for a good connection.
  • UL-FER - Short-term UL transport block error rate ("frame error rate"), before counting effects of HARQ retries.
  • UL-HFER - Long-term UL transport block error rate, including effects of HARQ retransmission and recovery.
  • UL-eff - UL PHY efficiency in bits per resource element x100.
  • 64QAM - True if 64-QAM is enabled for UL.
  • ULbytes - Total number of bytes transferred on UL at the MAC layer, including padding bytes.
  • DL-eff - DL PHY efficiency in bits per resource element x100.
  • 256QAM - True if 256-QAM is enabled for DL.
  • DLbytes - Total number of DL bytes transferred in the MAC layer on this connection.
  • DL-NACK - Short-term average HARQ NACK rate for DL. An estimate of DL frame error rate at the UE.
  • UC-RSSI - PUCCH RSSI in dB, on same scale as PUSCH. PUCCH is normally 6 to 20 dB lower than PUSCH.
  • UC-SNR - PUCCH post-despread signal to noise ratio in dB, which should be 6 or higher for a good connection.
  • UC-miss - Fraction of time when PUCCH expected to receive HARQ ACK/NACK or CSI but could not decode anything.
    • Shows reliability of PUCCH, with zero being ideal.
  • CQI - Fraction of time that CQI was received correctly on PUCCH.
  • Age - Age of the connection in seconds.
  • Idle - Idle time of the connection in seconds.
  • RSRP - DL RSSI of reference signals at the UE, in dBm. See Wikipedia RSRP. For a Lab Kit, -70 to -90 is normal, less than < -90 is weak.
  • RSRQ - DL channel quality at the UE. 0 is perfect, -1 .. -3 is good, less than -5 is poor. This number is a good predictor of DL throughput for this UE.
  • UL-BSR - Estimated number of bytes waiting for UL transmission in the UE.
  • DL-BSR - Number of bytes waiting for DL transmission in the eNodeB.

Example:

RNTI    AVGRSSI CURRSSI UL-SNR  UL-FER  UL-HFER UL-eff  64QAM   ULbytes DL-eff  256QAM  DLbytes DL-NACK UC-RSSI UC-SNR  UC-miss CQI     Age     Idle    RSRP    RSRQ    UL-BSR  DL-BSR
62      -2      -13     11      7%      2%      44      false   466k    391     false   12M     0%      -18     44      2%      50%     14      0       -70     -3      0       447k
61      -2      3       10      12%     1%      16      false   933     16      false   1454    0%      -18     12      0%      50%     15      0       -83     -5      0       21k