URLLC and eMBB are two typical scenarios of 5G networks: eMBB is mainly designed for public UEs to provide broad-bandwidth and high-bitrate communication service while URLLC is mainly designed for vertical industries which have high requirements in latency and reliability to provide ultra-reliable and low latency communication service. The two communication services hold different characteristics and different kinds of consumers. There are issues about resource multiplexing and resource preemption when they are deployed in the same network. This paper investigates the schemes for the resource multiplexing when the two services coexist from the aspects of management and the technologies involved are introduced in detail.

时频双聚合技术用于SA网络架构,在载波聚合技术基础上,通过较低频的2.1 GHz FDD载波来辅助较高频段的3.5 GHz TDD载波来实现上行覆盖增强,同时下行容量也得到提升.FDD NR和TDD NR载波深度协同,支持轮发及并发模式,使得频谱资源利用率最大化,具备多种高低频融合手段能够灵活适配多种组网场景,满足终端差异化网络需求.

As one of the three major 5G scenarios, URLLC has features such as ultra-low latency and ultra-high reliability. It provides high reliability transmission guarantee of real-time information for industrial automation, smart grid and other application scenarios. In order to realize the low latency and high reliability features of URLLC, 3GPP has added physical layer and high level technology solutions in R15, R16 and R17 phases respectively. This paper firstly introduces the key technologies of low latency and high reliability. Secondly, based on the typical services and requirements of URLLC, four major URLLC scenarios are proposed to be graded. After an in-depth discussion of the requirements, this paper gives deployment options for different hierarchical scenarios and various enabling technologies for URLLC, thus providing some support for the integration of URLLC with industry applications.

Improving the 5G resident ratio becomes one of the essential tasks of network operation in the period of high-speed development of 5G. This paper introduces a 5G construction efficiency evaluation method, which comprehensively evaluates the 5G network construction effect from four aspects: 5G resident rate, 5G coverage efficiency, 5G capacity efficiency, and 5G service absorption efficiency. LSTM algorithm is introduced into the proposed model, which helps to find the high-value area of accumulated problem cells. The test results show that the scheme has high accuracy based on the local network's data. With iterative evaluation and prediction based on the LSTM algorithm, telecom operators can continuously pull up 5G network operation and optimization efficiency, leading to a good reputation for 5G network services.

为深入挖掘超高可靠、低时延的应用场景和需求,将uRLLC的能力最优匹配到行业应用中,从时延、可靠性、速率和移动性4个维度构建了"1+3"uRLLC无线场景分级体系,对低时延、高可靠各关键技术及产业成熟度进行研究分析,提出基于关键功能点组合的各场景分级的解决方案,并通过外场试点进行测试验证.

首先分析VoLTE各语音业务质量与无线环境的相关性,给出VoLTE部署条件的无线网指标要求.其次,基于MR评估分析现网L1800小区满足VoLTE部署情况及需增补覆盖的小区数量,最后,针对弱覆盖区域,给出了eSRVCC+3G解决方案和L900解决方案,为VoLTE的部署及优化提供参考.

基于5G网络NSA与SA模式互操作策略开展深入研究,首先介绍5G网络下终端的不同RRC状态,根据不同的RRC状态引出互操作策略下的不同场景:空闲态重选和连接态互操作.详细介绍了上述2种互操作场景的信令流程,给出了运营商面临的建设与优化挑战,并从网络建设、网络优化以及互操作策略层面分别给出了相关建议.开展的互操作策略研究,一方面可以为5G网络NSA与SA模式互操作优化提供基本理论依据,另一方面指明了互操作策略发展的方向,可以有效指导网络的精准建设.

通过将不同的业务、用户映射到不同的QCI类型承载,并对不同的QCI类型承载配置不同的QoS参数,可以实现基于业务和用户的网络差异化服务.首先对NSA网络进行整体介绍,明确NSA网络无线承载类型,并逐一介绍相关的QoS参数.之后从业务差异化和用户差异化2个维度,制定相应的QoS策略,同时基于不同的策略,对无线网、传输网和核心网参数进行统一梳理,实现5G NSA网络端到端差异化QoS参数的合理化、标准化.

首先研究了5G NSA接入网共享方案,其次对基站设备、终端芯片、组网及运维优化复杂度等影响网络演进方案选择的因素进行了分析.最后对5G共建共享NSA向SA演进不同方案的技术要求、业务体验等进行深入研究,提出不同场景下的共享方案演进建议,供后续5G共建共享网络规划建设参考.

首先对VoLTE码率协商机制进行研究,通过测试分析影响VoLTE码率协商的因素,进而提出VoLTE码率协商的策略.其次,针对VoLTE商用初期存在VoLTE和2G/3G语音互通的现象,研究了语音编解码转换的机制,通过测试分析VoLTE与3G语音互通时编解码转换和编解码不转换2种情况对VoLTE语音质量MOS的影响,提出了VoLTE与CS语音互通的转码策略,为VoLTE网络部署商用策略及优化提供技术支撑.

首先,结合校园场景的特点及业务特性,分析了校园场景存在的深度覆盖不足、容量增长迅速、资源利用率高等导致的用户感知差的问题,以及业务分布不均衡存在的潮汐效应问题,其次根据校园不同功能区域的特性,给出了相应的校园深度覆盖小微基站解决方案,解决方案具有较强的实用性,为校园网络后续的规划和优化提供参考.

简要回顾了国外运营商的基站共享应用情况,介绍了基站共享的几种模式,对各种模式的优缺点进行了分析比较.说明了国内基站共享应用情况和最近开展的测试工作.根据近期进行的运营商4G基站共享测试情况,对于测试中出现的问题进行了分析,提出了切实可行的解决方案,并在进一步测试中得到了验证.最后基于试验成果,提出基站共享部署的原则和建议.

首先对高铁场景下VoLTE语音质量与无线信号的关联性进行分析,给出了为满足一定语音质量所需的RSRP和SINR的边界值.其次对高铁场景下频繁切换、RRC重建以及多普勒频移等因素对VoLTE语音质量的影响进行深入分析,最后有针对性地给出了VoLTE语音质量的提升方法,为VoLTE后续在高铁的部署及优化提供指导.

With the rapid development of LTE network,user behavior and consumption patterns have changed,the demand for network bandwidth continues to increase. In order to match the development of user services,the reasonable and effective LTE net-work load evaluation and expansion scheme is needed. Firstly,the load evaluation system of LTE network based on the two di-mensions of site access capacity and user perception rate is proposed. According to the LTE data analysis,we obtain the threshold value of the user’s perception of the limited network load evaluation index. Secondly,according to the results of the comparison between the statistical values of the network cel and the default threshold,the load attributes of the cel are de-termined. Final y,according to the characteristics of cel load and the evaluation index,targeted expansion and optimization of the adjustment program is proposed.

To give ful play to China Unicom’s multi-network synergies,achieve 4G/3G integration goal,the interoperability of LTE and 3G is the key to the solution. It analyzes and researches the key issues affecting the interoperation of LTE and 3G such as inter-operation solution selection,network parameter configuration,terminal and applications. Combined with CSFB voice cal pro-cedure,it also analyzes the key issues affecting voice performance. It provides the related solutions on the key interoperation issues affecting user perception.

It discusses the key problems of inter-RAT operation for PS service between LTE systems and the existing 2G/3G networks. Considering the performance of different schemes and the complexity of network updating,the inter-RAT operation strategy and scheme for the initial LTE network construction is proposed. And the parameter configuration rules and advices are also given both in idle and RRC connected state. It gives great reference to the inter-operation of China Unicom networks.

It analyzes current network data, and concludes that the increasing of smal traffic service brings the increasing of RRC con-necting time, the consumption of function resource also increased. Data service re-transmitting impacts on resource efficien-cy, the higher the re-transmitting rate, the lower the power efficiency. Based on the above, it presents new WCDMA radio re-source utilization rate calculation method to increase the impacts of signal ing overhead and data re-transmitting. Final y, it ana-lyzes the relation of user rate, radio resource utilization rate and user number, to provide suggestions on WCDMA network sim-ple extension standards.

It focuses on the antenna feeder positioning method with high efficiency based on the association of antenna system parame-ters and performance indexes of network. The method can find out and improve the implicit and explicit antenna feeder prob-lems in the existing network. The optimizing results are validated for base stations with rectifying antenna feeders.

LTE user-perceptive quality mainly includes two aspects, data rate and voice. Based on the theoretical analysis and test re-sults, it analyzes the influence on the data rate, such as overlapping coverage, PCI Mod3 interference, LTE/3G PS inter-opera-tion, etc. At the same time, it analyzes the key factors affecting LTE voice CSFB delay and return LTE network performance when voice is over. Furthermore, it presents the relevant optimization suggestions.

From the view of user-perceptive quality, it focuses on the cause of the access problems by analyzing the traffic statistics data and drive test data to make optimization scheme, improve the operation of the network environment and the quality of network operation.