城市通信管线网络工程设计实践研究

随着我国科学水平的不断提升,城市通信管线网络工程项目在如火如荼地展开中,工程项目的建设可有效提高人们生活水平以及加快经济发展速度。但是城市通信管线网络工程在建设期间,有工程量大、工序复杂、施工时间久、涉及部门多、工作人员数量多等情况,也容易受到多种因素所带来的影响,发生一些问题,无法取得更多的效益。因此,本篇文章主要对城市通信管线网络工程设计进行认真分析,以做参考。

城市通信管线网络工程设计实践探讨

城市通信管线网络工程在现代城市中扮演着关键角色,为人们提供高效、稳定的通信服务,推动城市的数字化转型。基于设计实践,探讨了通信管线网络工程设计的各个方面,包括前期准备工作、技术选择与方案设计、工程施工、系统集成与测试等。通过深入分析不同传输媒介、拓扑结构、设备选型以及安全性等因素,揭示了通信管线网络工程设计的复杂性和关键性,以期为相关人员提供参考,便于更好地应用城市通信管线网络工程设计的实际挑战。

三网融合环境下广电网络公司管线资源的采集研究

贵州省广播电视信息网络股份有限公司(以下简称:贵州广电网络公司)管线资源的有序收集、动态管理与合理利用,是提高资源综合效用的前提和基础,而贵州广电网络公司管线资源主要包括室内资源和室外资源,贵州广电网络公司管线资源呈现出多元、复杂的特性。本文首先概述了贵州广电网络公司管线资源的形成主体,提出管线资源采集的概念及其意义,同时详细地提出采集的设计方案,最后,提出信息网络环境下贵州广电网络公司管线资源采集的发展趋势。

地下通信管线动态信息管理系统的研制与应用

根据地下通信管线网络的特点与通信部门对管线网络规划、工程设计、维护管理与统计分析的实际需求，以通信主干管线为初始对象，以通信综合网络为终极目标，选用国产优秀地理信息系统基础软件平台———ＭＡＰＧＩＳ进行二次开发，建立地下通信管线动态信息管理系统，并对系统的应用现状与前景作了简要介绍．

光纤网络在通讯工程技术中的应用浅析

本文中,笔者首先从网络基站、通信中的复用技术、色散处理技术三方面阐述了当前我国光纤网络技术应用的关键技术,结合光纤网络现状展望了光纤网络在通讯工程技术中的应用前景,具有一定的实际参考价值。

城市综合管廊对有线传输建设必要性探讨

如今,国内正处在城镇化快速发展的关键时期,地下基础设施的建设也在逐渐推进。但是,从实际情况来看,由于很多城市中都采用了管线直埋的方式,这不仅造成了城市道路的反复开挖,也严重地影响到了城市的地下空间。因此,在这种情况下,加强城市综合管廊建设,就具有着十分重要的意义。因为,这不仅可以实现地下管线网络的合理管控,也能够增加城市的承载能力。在本文中,就针对城市综合管廊对有线传输建设必要性的相关内容进行了探讨。

熔体过滤器在天然气集输过程中的应用

熔体过滤器采用不锈钢金属纤维烧结毡为过滤介质,是一种具有无数不规则孔隙通道和一定厚度的载体。该过滤器具有可在恶劣环境条件下工作,无脱落,高过滤精度,高纳污容量,通流量大,耐高温、高压、耐腐蚀,可重复使用等特性。

有线电视管道井编码管理方法

随着有线电视管线网络规模的不断扩大,如何管理和定位管道井成了一个较难解决的问题。南京市区有线电视有6千多市政管井、约2万个小区管井,迫切需要加强管理。文章介绍了对有线电视管线网络管道井的编码管理规则和措施。

A Frameless Network Architecture for the Way Forward of C-RAN

The key technologies involved in the evolution of the Cloud-based Radio Access Network(C-RAN) are discussed in this paper. Taking the Frameless Network Architecture(FNA) as a starting point, a cell-lessbased network topology for a multi-tier Heterogeneous Network(Het Net) and ultra-dense network is proposed. The FNA network topology modeling is researched with centralized processing and distributed antenna deployments. The Antenna Element(AE) is released as a new dimensional radio resource that is included in the centralized Radio Resource Management(RRM) processes. This contributes to the on-demand user-centric serving-set associations with cell-edge effect elimination. The Control Plane(CP) and User Plane(UP) separation and adaptation are introduced for energy efficiency improvements. The centralized RRM and different optimization goals are discussed for fully exploring the merits from the centralized computing of C-RAN. Considering the complexity, near-optimal approaches for specific users' Quality-of-Service(Qo S) requirements are addressed. Finally, based on the research highlighted above, the way forward of C-RAN evolution is discussed.

Traffic Characteristics Based Dynamic Radio Resource Management in Heterogeneous Wireless Networks

The traffic with tidal phenomenon in Heterogeneous Wireless Networks(HWNs)has radically increased the complexity of radio resource management and its performance analysis.In this paper,a Simplified Dynamic Hierarchy Resource Management(SDHRM)algorithm exploiting the resources dynamically and intelligently is proposed with the consideration of tidal traffic.In network-level resource allocation,the proposed algorithm first adopts wavelet neural network to forecast the traffic of each sub-area and then allocates the resources to those sub-areas to maximise the network utility.In connection-level network selection,based on the above resource allocation and the pre-defined QoS requirement,three typical network selection policies are provided to assign traffic flow to the most appropriate network.Furthermore,based on multidimensional Markov model,we analyse the performance of SDHRM in HWNs with heavy tailed traffic.Numerical results show that our theoretical values coincide with the simulation results and the SDHRM can improve the resource utilization.

An integrated model for supplier selection process

In today’s highly competitive manufacturing environment, the supplier selection process becomes one of crucial activities in supply chain management. In order to select the best supplier(s) it is not only necessary to continuously tracking and benchmarking performance of suppliers but also to make a tradeoff between tangible and intangible factors some of which may conflict. In this paper an integration of case based reasoning (CBR), analytical network process (ANP) and linear programming (LP) is proposed to solve the supplier selection problem.

Online Internet Traffic Identification Algorithm Based on Multistage Classifier

Internet traffic classification plays an important role in network management. Many approaches have been proposed to clas-sify different categories of Internet traffic. However, these approaches have specific us-age contexts that restrict their ability when they are applied in the current network envi-ronment. For example, the port based ap-proach cannot identify network applications with dynamic ports; the deep packet inspec-tion approach is invalid for encrypted network applications; and the statistical based approach is time-onsuming. In this paper, a novel tech-nique is proposed to classify different catego-ries of network applications. The port based, deep packet inspection based and statistical based approaches are integrated as a multi-stage classifier. The experimental results demonstrate that this approach has high rec-ognition rate which is up to 98% and good performance of real-time for traffic identifica-tion.

SDN Based Next Generation Mobile Network With Service Slicing and Trials

Software-Defined Network （SDN） empowers the evolution of Internet with the OpenFlow, Network Virtualization and Service Slicing strategies. With the fast increasing requirements of Mobile Internet services, the Internet and Mobile Networks go to the convergence. Mobile Networks can also get benefits from the SDN evolution to fulfill the 5th Generation （5G） capacity booming. The article implements SDN into Frameless Network Architecture （FNA） for 5G Mobile Network evolution with proposed Mobile-oriented OpenFlow Protocol （MOFP）. The Control Plane/User Plane （CP/UP） separation and adaptation strategy is proposed to support the User-Centric scenario in FNA. The traditional Base Station is separated with Central Processing Entity （CPE） and Antenna Element （AE） to perform the OpenFlow and Network Virtualization. The AEs are released as new resources for serving users. The mobile-oriented Service Slicing with different Quality of Service （QoS） classification is proposed and Resource Pooling based Virtualized Radio Resource Management （VRRM） is optimized for the Service Slicing strategy with resource-limited feature in Mobile Networks. The capacity gains are provided to show the merits of SDN based FNA. And the MiniNet based Trial Network with Service Slicing is implemented with experimental results.

An autonomic joint radio resource management algorithm in end-to-end reconfigurable system

This paper presents the multi-step Q-learning(MQL)algorithm as an autonomic approach to thejoint radio resource management(JRRM)among heterogeneous radio access technologies(RATs)in theB3G environment.Through the'trial-and-error'on-line learning process,the JRRM controller can con-verge to the optimized admission control policy.The JRRM controller learns to give the best allocation foreach session in terms of both the access RAT and the service bandwidth.Simulation results show that theproposed algorithm realizes the autonomy of JRRM and achieves well trade-off between the spectrum utilityand the blocking probability comparing to the load-balancing algorithm and the utility-maximizing algo-rithm.Besides,the proposed algorithm has better online performances and convergence speed than theone-step Q-learning(QL)algorithm.Therefore,the user statisfaction degree could be improved also.

A Jury-Based Trust Management Mechanism in Distributed Cognitive Radio Networks

In the trust management scheme of the distributed cognitive radio networks, the absence of the central control devices cause many problems such as a lack of standardized control for trust computation, and the absence of the decision makers in trust evaluation and collaborative decision making. A trust management mechanism based on the jury system for distributed cognitive radio networks is proposed in this paper. The "jury user" is designed to collaboratively examine the reputation of the cognitive user in the networks and to perform data fusion and spectrum allocation for distributed cognitive radio networks. Simulation analysis results show that the proposed scheme can ensure accuracy and fairness in trust evaluation and improve effectiveness and flexibility of spectrum allocation.

Key-insulated encryption based group key management for wireless sensor network

The key exposure problem is a practical threat for many security applications. In wireless sensor networks (WSNs), keys could be compromised easily due to its limited hardware protections. A secure group key management scheme is responsible for secure distributing group keys among valid nodes of the group. Based on the key-insulated encryption (KIE), we propose a group key management scheme (KIE-GKMS), which integrates the pair-wise key pre-distribution for WSN. The KIE-GKMS scheme updates group keys dynamically when adding or removing nodes. Moreover, the security analysis proves that the KIE-GKMS scheme not only obtains the semantic security, but also provides the forward and backward security. Finally, the theoretical analysis shows that the KIE-GKMS scheme has constant performance on both communication and storage costs in sensor nodes.

On-line Detection of Gas Pipeline Based on the Real-Time Algorithm and Network Technology with Robot

The detection system integrates control technology, network technology, video encoding and decoding, video transmiss-ion, multi-single chip microcomputer communication, dat-abase technology, computer software and robot technology. The robot can adaptively adjust its status according to diameter (from 400 mm to 650 mm) of pipeline. The maximum detection distance is up to 1 000 m. The method of video coding in the system is based on fractal transformation. The experiments show that the coding scheme is fast and good PSNR. The precision of on-line detection is up to 3% thickness of pipeline wall. The robot can also have a high precision of location up to 0.03 m. The control method is based on network and characterized by on-line and real-time. The experiment in real gas pipeline shows that the performance of the detection system is good.

A FUNCTION NODE-BASED MULTIPLE PAIRWISE KEYS MANAGEMENT PROTOCOL FOR WIRELESS SENSOR NETWORKS AND ENERGY CONSUMPTION ANALYSIS

In this letter, a Function node-based Multiple Pairwise Keys Management (MPKMF) protocol for Wireless Sensor Networks (WSNs) is firstly designed, in which ordinary nodes and cluster head nodes are responsible for data collection and transmission, and function nodes are responsible for key management. There are more than one function nodes in the cluster consulting the key generation and other security decision-making. The function nodes are the second-class security center because of the characteristics of the distributed WSNs. Secondly, It is also described that the formation of function nodes and cluster heads under the control of the former, and five kinds of keys, i.e., individual key, pairwise keys, cluster key, management key, and group key. Finally, performance analysis and experiments show that, the protocol is superior in communication and energy consumption. The delay of establishing the cluster key meets the requirements, and a multiple pairwise key which adopts the coordinated security authentication scheme is provided.

Dynamic movement-based location update in LEO networks

Mobility management is an important aspect of the LEO systems. In terrestrial wireless network, the movement of the user triggers the location updating and determines the paging scheme, while in LEO satellite systems, the location updating and paging is mainly based on the movement of satellite. Terrestrial location management techniques must be altered to fit LEO systems. This paper introduces a modified movement based location update and paging scheme in LEO networks. In this scheme we propose the meta cell concept, which includes two spot beams of one satellite. First we present the location management scheme based on the architecture with meta cell location area. Then an analytical model is applied to formulate the cost of location updating and location paging for the and movement meta cell based dynamic location update scheme. The comparison of performance between meta cell architecture method and conventional signal spot cell architecture method is provided to demonstrate the cost effectiveness and robust of the proposed scheme under various parameters. To reduce the impact of meta cell architecture on location paging cost, we present forced location update strategy which used in the cases that the meta cell includes the two spot beams from different satellites.

基于ArcEngine的地下三维管线系统的设计与实现

地下管线是一个错综复杂的地下空间网络,在城市建设中占据重要的地位,关乎人民的日常生活。传统的二维管线的管理方式不容易直观地表现出地下管线的空间分布状况,且对二维管线的判读需要大量的专业知识。该文利用ArcGIS Engine组件,在二维管线的基础上,搭建三维管线平台系统,在实现管线三维可视化的同时,提供各种空间分析工具,为管线的设计、施工、决策提供支持。