SIB-2 Parameters in details

The parameters shown in the image are part of LTE (Long-Term Evolution) system configuration, specifically related to PRACH (Physical Random Access Channel), PDSCH (Physical Downlink Shared Channel), and PUSCH (Physical Uplink Shared Channel). These parameters play a critical role in ensuring proper network functionality. Here's why each parameter is important and the potential issues if it is missing:

PRACH-Config

PRACH is used for initial access and uplink synchronization.

• rootSequenceIndex (450)

  • Determines the sequence used for PRACH preamble generation.
  • Issue if missing: Random access failures, leading to problems in user equipment (UE) connection establishment.

• prach-ConfigIndex (5)

  • Defines PRACH transmission timing and availability.
  • Issue if missing: UEs might not know when and how to send PRACH, causing access delays or failures.

• highSpeedFlag (FALSE)

  • Indicates whether the UE is in high-speed mode, which affects PRACH format selection.
  • Issue if missing: PRACH format may be incorrectly selected, leading to failures in high-speed scenarios.

• zeroCorrelationZoneConfig (12)

  • Defines the separation between different PRACH sequences to reduce interference.
  • Issue if missing: Increased interference and higher collision probability among UEs.

• prach-FreqOffset (3)

  • Determines the frequency offset for PRACH transmissions.
  • Issue if missing: PRACH signals may collide with other uplink signals, affecting network access.

PDSCH-ConfigCommon

PDSCH is responsible for carrying downlink data.

• referenceSignalPower (21)

  • Defines the power level of the reference signal, which helps UE estimate channel quality.
  • Issue if missing: Poor channel estimation, leading to reduced downlink performance and increased decoding errors.

• p-b (1)

  • Defines power control adjustments for PDSCH.
  • Issue if missing: Incorrect power allocation, leading to inefficient resource utilization and degraded signal quality.

PUSCH-ConfigCommon

PUSCH is used for carrying uplink data from the UE to the network.

• n-SB (1)

  • Defines the number of sub-bands for frequency hopping in uplink transmissions.
  • Issue if missing: Inefficient frequency hopping, leading to poor interference mitigation.

• hoppingMode (interSubFrame)

  • Defines how frequency hopping is applied (intra-subframe or inter-subframe).
  • Issue if missing: Incorrect hopping configuration, leading to suboptimal frequency diversity.

• pusch-HoppingOffset (6)

  • Determines the offset for frequency hopping in PUSCH.
  • Issue if missing: Potential interference issues and degraded uplink performance.

• enable64QAM (TRUE)

  • Allows the use of 64QAM (higher modulation) for uplink transmission.
  • Issue if missing: Limited to lower modulation schemes (e.g., 16QAM), reducing uplink throughput.

Overall Impact

If these parameters are missing or incorrectly configured, major network issues may arise, including:

• Random access failures
• Call drops or connection failures
• Poor uplink and downlink throughput
• Increased interference
• Inefficient spectrum usage
• Poor user experience due to latency and data rate reduction