当前移动通信网络的规划与优化探讨

保持移动通信网络的持续、高效、高质量的运营,网络的规划和优化是必不可少的内容.本文概述了当前移动通信网络规划和优化的必要性、特点、主要内容和方法,同时对未来移动通信网络的评估体系和优化的一些发展方向做了进一步的探讨.     

A mathematical optimization approach for cellular radio network planning with co-siting

Wireless network operators are continuously enhancing their networks by deploying newly developed wireless technologies. In order to reduce the deployment costs, the operators try to reuse as many components of the existing networks as possible. This includes the possibility of reusing base station sites in order to reduce costs such as site rental, site acquisition, and backhaul connectivity. In this paper, we model the problem of base station co-siting as a nested mixed integer optimization problem in order to optimize target objectives that are a function of performance and cost. The formulated problem takes as input an area of interest with existing fixed sites and obtains as output the optimal number and locations of required sites including newly deployed and co-sited with the fixed sites. The goal is to minimize the deployment cost of the new network by reusing as many existing sites of the existing network as possible while guaranteeing that the outage probability is below a target threshold. We propose and implement an algorithm to solve the formulated optimization problem as a function of the mobile station distribution and the existing fixed site locations. A UMTS/GSM co-siting scenario is used as a case study in order to evaluate the performance of the proposed algorithm. Results show that the optimal solution depends on the mobile station distribution and the existing sites in addition to a threshold parameter that provides a tradeoff between the deployment cost and the outage probability.     

一种基于设计资源数据库的干线网络规划设计系统

本文针对“大数据时代”传统干线网络规划设计方法面临的困境,设计实现了一种基于资源数据库的干线网络规划设计新工具,归集了现网资源数据,实现了标准化数据管理、多因素约束自动排路、局站系统连接表生成、多层次拓扑呈现等核心能力,有效缓解了大规模网络建设引发的资源数据管理难题和设计效率提升压力.     

A cellular neural network and utility-based radio resource scheduler for multimedia CDMA communication systems

The paper proposes a cellular neural network and utility (CNNU)-based radio resource scheduler for multimedia CDMA communication systems supporting differentiated quality-of-service (QoS). Here, we define a relevant utility function for each connection, which is its radio resource function weighted by a QoS requirement deviation function and a fairness compensation function. We also propose cellular neural networks (CNN) to design the utility-based radio resource scheduler according to the Lyapunov method to solve the constrained optimization problem. The CNN is powerful for complicated optimization problems and has been proved that it can rapidly converge to a desired equilibrium; the utility-based scheduling algorithm can efficiently utilize the radio resource for system, keep the QoS requirements of connections guaranteed, and provide the weighted fairness for connections. Therefore, the CNNUbased scheduler, which determines a radio resource assignment vector for all connections by maximizing an overall system utility, can achieve high system throughput and keep the performance measures of all connections to meet their QoS requirements. Simulation results show that the CNNU-based scheduler attains the average system throughput greater than the EXP [9] and the HOLPRO [5] scheduling schemes by an amount of 23% and 33%, respectively, in the QoS guaranteed region.     

Deployment of a mobile wireless sensor network with k-coverage constraint: a cellular learning automata approach

Deployment of a wireless sensor network is a challenging problem, especially when the environment of the network does not allow either of the random deployment or the exact placement of sensor nodes. If sensor nodes are mobile, then one approach to overcome this problem is to first deploy sensor nodes randomly in some initial region within the area of the network, and then let the sensor nodes to move around and cooperatively and gradually increase the covered section of the area. Recently, a cellular learning automata-based deployment strategy, called CLA-DS, is introduced in literature which follows this approach and is robust against inaccuracies which may occur in the measurements of sensor positions or in the movements of sensor nodes. Despite its advantages, this deployment strategy covers every point within the area of the network with only one sensor node, which is not enough for applications with k-coverage requirement. In this paper, we extend CLA-DS so that it can address the k-coverage requirement. This extension, referred to as CLA-EDS, is also able to address k-coverage requirement with different values of k in different regions of the network area. Experimental results have shown that the proposed deployment strategy, in addition to the advantages it inherits from CLA-DS, outperforms existing algorithms such as DSSA, IDCA, and DSLE in covering the network area, especially when required degree of coverage differs in different regions of the network.     

基于CDMA的三种3G标准网络规划设计的异同

首先阐述了移动网络规划的原则和策略,其次分析CDMA移动通信系统无线网络规划的技术特点,最后对基于CDMA的三种3G标准移动通信网络在无线网络规划方法上的异同进行了比较和探讨。     

基于移动通讯网络的流媒体播放系统设计方案

流媒体主要是指在网络系统中,使用流动式的传输方式和传输技术连续的进行播放的一种及时性媒体,也就是在互联网系统中,以数据流的形式对信息进行实时的发布和播放视频多媒体信息。在这里所说的流媒体技术就是将连续的影像和声音经过必要的压缩和处理之后,将其放在网络的服务器上,保证能够在视频和资讯的浏览者一般收看信心资讯一边实现在线下载,而不再需要等到多个媒体文件下载完成之后不就可以即时的进行观看的一种技术。在流媒体发展过程中,移动流媒体技术就是把流媒体技术和移动通信设网络技术相互结合,让移动用户能够通过移动终端浏览多媒体信息的一种新技术。本文主要对移动流媒体的系统设设计方案进行了必要的分析和研究,并就该系统中的各项功能进行了详细的分析和研究,针对移动流媒体的特性就本系统采用的编码标准进行了详细的分析,希望通过本次研究对更好的促进=移动通信网络流媒体播放系统的设计有一定的帮助。     

移动网络规划后评估系统设计与应用

随着全国范围内4G/5G网络大规模的商业部署,如何系统全面地评估无线网络规划建设效果,成为网络建设工作中亟需解决的问题.本文基于多维度大数据分析,搭建后评估体系,开展全过程、多角度、多层面的基站规划方案质量分析与评价,实现了站点从需求、规划、设计、入网的全生命周期管理,为后续资源精准投入提供了科学依据和参考.     

有线电视网络资源管理系统建设规划及注意事项

本文从实际建设和使用角度出发,对有线电视网络资源管理系统建设经验进行了总结。论述了有线电视网络资源管理系统的建设目标,介绍了系统中资源数据的分类和分层,并主要对系统建设时需要注意的问题、失败原因等进行了详细分析和阐述。     

A combined OFDM-CsDMA approach to cellular mobile communications

We present a combined orthogonal frequency-division multiplexing (OFDM) and code-division multiple-access cellular system. It is derived from the OFDM model by introducing an extra code-shift division multiple access layer. This mitigates intercell interference without affecting intracell orthogonality and such property can be maintained in multipath environments. The new scheme is suitable for both up and down links. It retains the low-receiver complexity property of the OFDM system     

区块链在蜂窝移动通信系统中的研究现状及发展趋势

区块链本质上是分布式数据库，无需第三方中介机构即可安全更新状态。将区块链技术引入6G蜂窝移动通信系统中以保障用户的隐私安全，减少资源分配和通信服务成本，支持不同分布式应用，从而实现移动通信和区块链技术的有机结合，被预测为6G蜂窝移动通信的关键技术之一。从区块链结合物联网（IoT）、边缘计算、频谱分配、干扰管理方面展开了详细的介绍，阐述了近年来国际学术界在该方向的最新研究进展，并在此基础上对6G蜂窝移动通信中区块链技术的发展趋势进行了进一步的展望。     

Hypergraph models for cellular mobile communication systems

Cellular systems have hitherto been modeled mostly by graphs for the purpose of channel assignment. However, hypergraph modeling of cellular systems offers a significant advantage over graph modeling in terms of the total traffic carried by the system. For example, we show that a 37-cell system when modeled by a hypergraph carries around 30% more traffic than when modeled by a graph. We study the performance of channelized cellular systems modeled by hypergraphs in comparison with those modeled by graphs. For this purpose, we have evaluated the capacities of these cellular networks defined in McEliece and Sivarajan (1994). Evaluation of the capacity necessitates generation of maximal independent sets of hypergraphs. We describe some new algorithms that we have developed for this purpose     

Handover scheme for mobile cellular communication systems

A new scheme for minimising handover failure probability in mobile cellular communication systems, by exchanging channels between two mobiles moving in opposite directions across the endeavour area of adjacent cells is presented. The performance evaluation of the new scheme is carried out by computer simulation of a two cell model     

5G传输网络承载方案分析

5G时代3类典型场景的业务需求对承载网络在容量、时延和组网灵活性方面提出了更高的要求,同时针对无线网和核心网架构的变化提出了网络切片、增强路由转发功能等要求。首先分析5G的承载需求,重点考虑5G的3类典型业务场景、无线和核心网的架构变化;然后结合现网100GE PTN的实际应用情况,重点围绕容量、时延等维度完成需求与网络现状的对标;最后提出了网络回传、机房配套的演进方案。     

浅谈移动通信网的网络优化

近年来随着移动通信网络的迅猛发展，在市场需求的驱动下，移动网络不断扩容，网络的规划也一再随之调整。建设周期短，发展速度快，前后工期重叠进行，造成整个通信网络的各种资源不能得到合理的应用，网络运行效率低。为使得网络资源能够合理配置和应用，移动通信网络的网络优化工作已经成为移动通信运营商提高服务水平，保障通信质量的重要工作内容。     

Modeling and performance evaluation of a cellular mobile network

An analytic model of cellular mobile communications networks with instantaneous movement is investigated in this paper. This cellular mobile network is showed to be equivalent to a queueing network and furthermore the equilibrium distribution of this cellular mobile network is proved to have a product form. The explicit expressions for handoff rates of calls from one cell to another, the blocking probability of new calls and handoff calls are then obtained. Actual call connection time (ACCT) of a call in this cellular mobile network is characterized in detail, which is the total time a mobile user engages in communications over the network during a call connection and can be used to design appropriate charging schemes. The average ACCT for both complete call and incomplete call, as well as the probability for a call to be incomplete or complete, are derived. Our numerical results show how the above measures depend on the new call arrival process for some specific reserved channels numbers in each cell. The results presented in this paper are expected to be useful for the cost analysis for updating location and paging in cellular mobile network.     

Dynamic resource allocation in mobile heterogeneous cellular networks

User mobility is a challenging issue in macro and femto cellular networks for the fifth-generation and newer mobile communications due to the time-varying interference and topology experienced. In this paper, we consider an OFDMA-based two-tier network with one macro cell and several femto cells, wherein each macro user and/or femto user can leave or enter its serving cell frequently, referred to as user mobility. A resource allocation problem with different rate requirements of mobile users is then formulated. Assuming well knowledge of the user locations and the channel state information, we propose a dynamic algorithm with static and dynamic parts for a better trade-of between computational complexity and system throughput. The static algorithm, named interference weighted cluster algorithm in this paper, is based on the graph theory to cluster the femtocells by minimizing the interference between clusters, while the dynamic algorithm is to deal with the user mobility by sharing the resource blocks under the constraints of rate requirements. Numerical results are demonstrated to show the effectiveness of the proposed dynamic resource allocation algorithm in terms of capacity, computational time, and outage probability.

     

An approach for location area planning in a personal communication services network (PCSN)

This paper deals with an approach for planning location areas (LAs) in a personal communication services network (PCSN) to be overlaid on an existing wired network. Given the average speed of mobile terminals, the number of mobile switching centers (MSCs), their locations, call handling capacity of each MSC, handoff cost between adjacent cells and call arrival rate, an important consideration in a PCSN is to identify the cells in every LA to be connected to the corresponding MSC in a cost effective manner. In this work, while planning a location area, we present a two-step approach, namely optimization of total system recurring cost (subproblem I) and optimization of hybrid cost (subproblem II). The planning first determines the optimum number of cells in an LA from subproblem I. Then, it finds out the exact LAs by assigning cells to the switches, while optimizing the hybrid cost which comprises the handoff cost and the cable cost, in subproblem II. This divide-and-conquer strategy provides a practical way for designing LAs. As our approach toward LA planning takes into accounts both cost and network planning factors, this unique combination will be of great interest to PCSN designers. It develops an optimum network planning method for a wide range of call-to-mobility ratios that minimizes the total system recurring cost while still ensuring a good system performance. Our study shows that acceptable results are achievable with a reasonable computational effort, which supports the engineered planning of a PCSN.     

多业务CDMA蜂窝移动通信系统的功率控制

本文提出了多业务CDMA蜂窝移动通信系统的一种下行链路功率控制策略，系统的最优功率分配可以归结为求解归一化链路增益矩阵在有约束条件下的最大实特征值。在对系统的最优功率分配进行理论分析的基础上，给予了相应的仿真结果，并针对实际系统负载过重的情形，提出了按照业务优先级别逐步去除小区用户的功率控制策略。