RACH-less Handover with Early Timing Advance Acquisition for Outage Reduction

מושגי ליבה

Proposing a RACH-less handover scheme with early timing advance acquisition significantly reduces outage and handover interruption time in 5G networks.

תקציר

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.

סטטיסטיקה

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.

ציטוטים

תובנות מפתח מזוקקות מ:

RACH-less Handover with Early Timing Advance Acquisition for Outage Reduction

by Subhyal Bin ... ב- arxiv.org 03-18-2024

https://arxiv.org/pdf/2403.10286.pdf

שאלות מעמיקות

How can the proposed RACH-less handover scheme impact network scalability beyond reducing outage

The proposed RACH-less handover scheme can have a significant impact on network scalability beyond just reducing outage. By streamlining the handover process and minimizing the interruption time, it allows for more efficient utilization of network resources. This efficiency translates into improved overall network capacity and performance, enabling the network to handle a larger number of users and devices without compromising on reliability or quality of service. Additionally, with faster handovers and reduced outage periods, the network can support higher mobility scenarios seamlessly, making it more adaptable to dynamic user movements in diverse environments.

What potential drawbacks or limitations might arise from implementing a RACH-less approach in real-world scenarios

While the RACH-less approach offers several benefits in terms of reducing outage and improving network efficiency, there are potential drawbacks or limitations that may arise from its implementation in real-world scenarios. One key limitation is related to signaling overhead increase due to additional messages exchanged between the UE, serving cell, and target cell for early TA acquisition. This added signaling complexity could potentially lead to congestion issues or increased latency if not managed effectively. Moreover, relying heavily on early TA acquisition assumes strong radio links between cells at all times which may not always be feasible in practical deployments where environmental factors or interference could affect signal strength.

How could advancements in early TA acquisition for CHO influence future developments in wireless communication technologies

Advancements in early TA acquisition for Conditional Handover (CHO) have the potential to influence future developments in wireless communication technologies significantly. By optimizing synchronization processes through early TA acquisition mechanisms like those proposed in this study, we pave the way for enhanced mobility management strategies that prioritize seamless connectivity during handovers. These advancements can drive innovations towards ultra-reliable low-latency communications (URLLC) requirements by ensuring minimal disruption during mobility events while maintaining high levels of reliability and quality of service across evolving 5G-Advanced networks and beyond.