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Packet Duplication for URLLC in 5G: Architectural Enhancements and Performance Analysis.

IEEE Network(2018)SCI 1区SCI 2区

Huawei Technol Canada

Cited 104|Views46
Abstract
URLLC use cases demand a new paradigm in cellular networks to contend with the extreme requirements with complex trade-offs. In general, it is exceptionally challenging and, resource usage-wise, prohibitively expensive to satisfy the URLLC requirements using the existing approaches in LTE. To address these challenges 3GPP has recently agreed to adopt PD of both UP and CP packets as a fundamental technique in 5G NR. This article investigates the theoretic framework behind PD and provides a primer on the recent enhancements applied in the NR RAN architecture for supporting URLLC. It is shown that PD enables jointly satisfying the latency and reliability requirements without increasing the complexity in the RAN. With dynamic control capability, PD can be used not only for URLLC but also to increase the transmission robustness during mobility and against radio link failures. The article also provides numerical results comparing the performance of PD in various deployment scenarios. The numerical results reveal that in certain scenarios, performing PD over multiple links results in lower usage of radio resources than using a single highly reliable link. It is also found that to improve radio resource utilization while satisfying URLLC requirements, enabling PD in scenarios such as cell edge is crucial where the average SNR of the best (primary) link and the variation in SNR between all accessible links is typically low. In essence, the PD technique provides a cost-effective solution for satisfying the URLLC requirements without requiring major modifications to the RAN deployments.
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Long Term Evolution,Protocols,Reliability theory,5G mobile communication,Signal to noise ratio,Quality of service
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要点】:本文研究了在5G NR中采用数据包复制(Packet Duplication, PD)技术以满足URLLC极端要求的理论框架和最新网络架构增强,证实了PD技术能够在不增加RAN复杂性的情况下同时满足延迟和可靠性要求,并提高了传输鲁棒性。

方法】:文章提出并分析了3GPP在5G NR RAN架构中实施的数据包复制技术,动态控制PD以适应不同网络环境,满足URLLC的需求。

实验】:文章提供了在不同部署场景下PD性能的数值结果,使用了特定的场景模型,并发现通过在多个链路上执行PD,可以在某些情况下比使用单个高可靠性链路更节省无线电资源,特别是在小区边缘等场景中启用PD对提高无线电资源利用率、满足URLLC要求至关重要。