Radio Access Network Slicing Based on C/U Plane Separation

Network slicing achieves many interests from industry and academics due to its flexibility and scalability.In this paper,we present a novel slicing scheme for radio access networks(RANs) based on control/user(C/U) plane separation.Firstly,we divide e NBs into two sub-e NBs called Ce NB and Ue NB,for transmitting control data and user data respectively,thereby facilitating C/U plane separation.Secondly,upon Ce NBs and Ue NBs being virtualized,we develop two RAN slices for control and user plane respectively.Experimental results show the feasibility of the proposed scheme.

Transferring in control plane for 5G heterogeneous networks

The heterogeneous network with the separation of the control plane and user plane(C/U) is an evolutionary approach to the fifth generation(5 G) to achieve high system coverage and capacity. To minimize signaling load of the core network when there is a macro base station(BS) failure in the control plane, a scheme of transferring the control of small cells under the coverage of the failure macro BS to the neighbor macro BSs is proposed. The average handover rates between small cells related to user mobilities, the extended coverage of the neighboring macro BSs under the constraint of transmitting power and the load balance index of the system are analyzed, based on which the formula of maximizing the handovers processed by macro BSs is constructed and further solved by the convex optimization methods. Simulation results indicate that the proposed scheme can effectively increase the total handovers processed by the macro BSs and thus reduce the signaling load of the core network.

Analysis and Field Trial Results on C-Plane and U-Plane Split Scheme in Virtual Sectorization System

Capacity enhancement approaches are being intensively studied in the past few years to address the soaring capacity demands. The network densif ication technology is recognized as one promising solution. However,the ultra-dense network scheme suffers from severe interference and frequent handovers,which degrade the system performance significantly. In this paper,a virtual sectorization system leveraging a C-plane(control signaling plane) and U-plane(user data plane) split scheme is proposed to overcome these two fundamental problems. Besides,a well-designed fi eld trial is conducted to evaluate its performance. The results show that the interference can be avoided,which leads to a tremendous increase in system capacity. In addition,the number of handovers is also greatly decreased. Thus,the trial results verify the huge potential of the C-plane and U-plane split scheme for system capacity and user experience enhancements.

硬核点过程随机蜂窝网络能量效率优化研究

基于控制/用户平面分离的异构网络架构是5G中的一种重要组网方式。微基站的密集部署引发了巨大的能量消耗问题从而无法保障用户的高质量服务(quality of service,QoS)。针对此问题,基于具有最小距离约束特性的硬核点过程(hard-core point process,HCPP),研究了控制/用户平面分离网络架构中能量效率的优化方法。通过联合优化网络频谱分配比、基站的密度和基站配备的天线数量,设计了最小化基站平均能耗的优化问题。由于问题是非凸的,进一步为能量效率优化问题提出了低复杂度的迭代算法,当算法迭代直至收敛可得到天线数和网络频谱分配比的最优解,最终实现基站能耗的最小化。仿真结果表明,该算法在控制/用户平面分离网络架构下有效地降低了基站的平均功耗并提升了系统能效。

LTE系统时延分析

介绍由eNodeB构成的单层结构的LTE系统对时延的要求,从用户面时延、控制面时延进行具体的理论分析,并通过举例进一步介绍LTE系统在inter-eNB切换中的业务中断时延。

面向5G的核心网网络演进方案研究

随着数据业务和物联网技术的快速发展,基于不同速率、不同时延等要求的接入网络需求逐渐呈现层次化差异,传统的移动通信网络难以满足海量的人、机通信需求,为此5G网络成为全球运营商关注的重点。区别于4G网络的单场景,5G网络提出了三大差异化的应用场景:极致的移动宽带、大规模的物联网和超可靠通信。本文基于5G的应用场景及能力要求、5G核心网的基本结构、现有核心网向未来演进策略等内容进行论述,为5G的网络建设提供指导意见。