System Information Block Type 4 (SIB4) plays a crucial role in 5G NR (New Radio) networks. It primarily conveys information related to intra-frequency cell reselection. Specifically, it provides parameters necessary for User Equipment (UE) to evaluate and rank neighboring cells operating on the same frequency as the serving cell. These parameters assist the UE in determining if a handover to a different cell within the same frequency band is warranted based on signal strength and quality measurements.
The transmission of SIB4 is significant because it optimizes mobile network performance by enabling efficient cell reselection. Without adequate SIB4 information, the UE might remain connected to a weaker cell, resulting in a degraded user experience. Furthermore, its presence is important for network stability and efficient resource utilization. Early generations of cellular technology used different mechanisms, but SIB4 represents a standardized and efficient method for managing intra-frequency mobility within 5G NR.
