Основні поняття
Proposing a RACH-less handover scheme with early timing advance acquisition significantly reduces outage and handover interruption time in 5G networks.
Анотація
The paper introduces a RACH-less handover signaling scheme for the 3rd Generation Partnership Project (3GPP) conditional handover mechanism to reduce outage in 5G networks. By decoupling the CHO preparation and execution phases, the proposed scheme aims to establish initial synchronization between the UE and the target cell through early acquisition of timing advance. This approach minimizes the RACH process, leading to an 18.7% reduction in outage and a 43.2% decrease in handover interruption time based on system-level simulations. The study focuses on inter-cell mobility, intra-cell mobility, SINR modeling, and breakdown of handover interruption time components. Simulation parameters and results demonstrate the effectiveness of the proposed scheme in improving network reliability by reducing outage duration due to handovers.
Статистика
Results based on system-level simulation: proposed scheme reduces outage by 18.7% and handover interruption time by 43.2%.
Total number of successful handovers: 17.3 KPI/UE/min.
Mobility failures account for around 8% compared to total successful handovers.
Outage reduced by 43.2% relative to typical RACH-aided handover for CHO mechanism.
Signaling overhead increases by about 27% over radio interface and 20% over Xn interface with proposed RACH-less scheme.