GSM网掉话、话务均衡及通话干扰的原因及解决方法

讨论了ＧＳＭ数字移动通信无线系统网络优化问题;分析了目前网络中掉话、干扰、话务不均衡等一些常见问题产生的原因,给出了解决这些常见问题的网络优化方法及经验。     

改善GSM网络拥塞、提高话务量的有效方法

本文详细分析了网络无线参数调整和基站天线调节对GSM网络覆盖、话务均衡和干扰的影响 ,然后给出了合理建设微蜂窝和直放站的原则。优化实例表明文中讨论的方法能够很有效地减少网络拥塞 ,提高网络话务量     

GSM网卓话,话务均衡及通话干扰的原因及解决方法

讨论ＧＳＭ数字数字移动通信无线系统网络优化问题,分析了目前网络中掉话,干扰,话务不均衡等一些常见问题产生的原因,给出了解决这些常见问题的网络优化方法及经验。     

电话与电话局

Z99-51300-26 9915456支持 NS/EP 电信要求的高级智能网(AIN)的安全[会,译,英]/钱京梅//军事通信技术发展译文集:特殊技术分册.—26～35(C)9915457GSM 网掉话、话务均衡及通话干扰的原因及解决方法[刊]/朱长国//电信技术.—1999,(5).—31～33(L)讨论了 GSM 数字移动通信无线系统网络优化问题;分析了目前网络中掉话、干扰、话务不均衡等一些常见问题产生的原因,给出了解决这些常见问题的网络优化方法及经验。     

GSM系统中话务均衡的研究

移动通信在我国已有长足发展，但仍有一些问题值得我们注意，特别是无线信道话务负荷的不均衡表现得尤为突出，本文对此问题首先分析了GSM移动通信系统的话务均衡的概念，然后又具体分析了其在网络规划和优化中的实现方法。     

GSM900/1800双频网话务均衡与应用

为了改善小区拥塞情况,提高TCH利用率,介绍了GSM900/1800组网方式和无线传播的特点,通过对双频网话务均衡优化方法的分析,提出了对小区重选及切换参数的设置的优化方案,实现了GSM1800对话务量的吸收作用,达到了双频网话务均衡的目标。     

一种GSM多波束天线的研究

目前国内的人口密集高话务场景无线覆盖存在困局。选址困难、邻频干扰等等问题制约着常规覆盖方案的实施。闲时过覆盖、忙时欠覆盖,载波资源存在浪费、配置不均衡的情况。文章介绍一种新型特种天线,解决此类场景覆盖问题。     

窄带CDMA无线网络的规划和设计

本文对窄带ＣＤＭＡ无线网络设计中的无线覆盖，话务配置，干扰等问题进行了分析。     

统一TMM提高PHS网络优化效率

众所周知,采用TMM数据进行话务分析,是PHS网络优化中至关重要的方面.TMM数据可以记载每次通话过程中的空中接口部分(即基站与手机间)话务流程各阶段完成情况的计数、话务占用时长情况、异常发生情况等.通过话务分析,可分析资源的话务平衡、无线干扰发生、通信质量、异常掉话等情况.     

EWSD网络上的话务均衡方式分析

详细介绍了ＥＷＳＤ交换机的话务分担、ＳＫＩＰ话务均衡、ＴｒｕｎｋＧｒｏｕｐＣｌｕｓｅｒ话务均衡３种话务均衡方式，并对它们进行了比较分析，最后介绍了南宁本地网话务均衡方式的选用情况。     

多径衰落移动无线系统中的同频道干扰预测

同频道干扰是微蜂窝结构移动通信网所要考虑的一个核心问题，要想成功地对任何一种频率再用无线系统进行规划设计，就必须很好地了解并分析研究同频道干扰对系统性能的影响。本文对具有Ｎａｋａｇａｍｉ衰落和对数正态衰落的同频道干扰特性进行了理论分析，并提出了对微蜂窝多径衰落移动无线电系统中的同频道干扰及其影响进行预测的近似方法。     

一种新的认知无线电非合作功率控制博弈算法

当认知无线电网络以"衬底式"(Underlay)的方式与主用户网络共享频谱时,需要对认知用户进行功率控制,以确保认知用户在不干扰主用户的前提下,公平地共享认知频谱资源。利用博弈分析的方法,设计了一个基于链路增益因子的代价函数,并据此提出了一种新的非合作功率控制博弈算法。仿真结果表明,该算法的均衡结果既改善了用户的帕累托(Pareto)性能,又提高了链路增益较差的用户的吞吐量,实现了网络资源的平等共享。     

认知无线Ad hoc网络的功率控制

当FCC提出传统电视系统和认知无线电网络频谱共享,以增加频谱的利用率时,主要涉及到的问题之_是来自认知无线电网络的干扰不得影响主用户的QoS。在本文中,考虑由低功耗个人／便携设备组成的认知无线电网络与传统电视系统同时运作的情况。本文在保证主用户和认知用户的QoS的情况下,推导出问题的可行性条件,并提出集中式和分布式两种解决方案,最大限度地提高认知用户的能源效率。并且通过仿真表明该方案的有效性。     

新型无线接入网络架构研究

在高速发展的移动业务和频谱资源受限的环境下,传统的无线接入网架构面临着诸多挑战:系统容量干扰受限、多标准和动态网络负载缺乏灵活性以及高额的建设和运维成本等。为了应对这些挑战,下一代无线接入网在空口逐渐向协作化方向发展,基站之间以协作的方式进行无线资源优化配置来提高空口的频谱效率;此外,通过将基带资源集中化,利用基带资源虚拟化等技术手段,可以极大地提升基站设备效率,降低系统能耗,同时更有效地利用站址资源,满足低成本建设与维护网络的要求。     

Energy-based interference analysis of heterogeneous packet radio networks

While the use of radio technology for wireless data communications has increased rapidly, the wide variety of radio interfaces being used has made interference investigations hard to perform. With that in mind, we present a novel approach for analyzing packet radio communications, applicable to interfering heterogeneous networks, which leads to tractable analytical expressions. The core of the approach is an analytical framework modeling each network with individual properties for the packet types and the channel sets used, while taking path loss between all network nodes into account. Furthermore, we present a derivation of closed-form expressions for the throughput of the networks, thus allowing for the investigation of important mechanisms limiting network and system performance. The expressions enable fast and flexible analysis to be performed without extensive computer simulations or measurement campaigns. To illustrate the use of the framework and the strength of the closed-form expressions, we analyze a heterogeneous example system consisting of one IEEE 802.11b network and multiple Bluetooth networks that use multiple packet types. In the analysis, we also take the adjacent channel interference into account when calculating network throughput as functions of the number of interferers in the system.     

分层式分组无线网络结构

介绍了一种分层式一无线网络的结构，这种网络结构使得战术武器指挥，控制，通信与情报系统，在强干扰和大量移动用户的环境下，具有较强的抗干扰性和灵活性。     

WCDMA无线网络规划的分析

文章介绍了WCDMA系统及其无线规划的特点,给出了无线规划的一般过程,详细讨论了WCDMA无线规划中业务量、系统容量、负载因子、干扰容限和小区覆盖半径等系统参数的确定,最后指出了WCDMA网络规划研究的重要性.     

Improving Water-Filling Algorithm to Power Control Cognitive Radio System Based Upon Traffic Parameters and QoS

Cognitive radio scenario is based upon the ability to determine the radio transmission parameters from its surrounding environment. Power allocation in cognitive radio systems improves secondary network capacity subject to primary receiver interference level threshold. In this paper, statistical property of the injected interference power in primary user channel is used to establish the container bottom for each subcarrier employing water filling algorithm. In other words, the container bottom level of each subcarrier depends on the injected interference in primary user (PU) (most probably from the overloaded neighbor subcarriers). Traffic statistical parameters are also employed to formulate power allocation problem. Within this context, quality of service constraint is considered also to improve performance of power allocation algorithm. Simulation Results show that the injected interference in PU is decreased while the secondary user capacity improves. Indeed, the proposed algorithm is more compatible than a waterfilling algorithm with cognitive radio system constraints.     

WCDMA Downlink Coverage Reduction Due to Adjacent Channel Interference

This paper determines the coverage reduction of the Wideband CDMA (WCDMA) downlink in the case of interference, due to adjacent narrowband system. The coverage reduction has been evaluated in terms of blocking area around the interfering base station. The analysis takes into account different interference mechanisms and their individual effects to the coverage. The interference mechanisms which have been considered here are the out-of-band emissions of the base station transmitter, the adjacent channel interference due to non-ideal sideband filtering, the intermodulation and the crossmodulation. The coverage effects in realistic network environment have been computed by using accurate ray-tracing propagation models designed for the path loss calculation in the urban environment. In the numerical examples, the effect of GSM interference has been demonstrated, but the method can be utilized with other narrowband systems as well. The results can be utilized in radio system design, radio network planning (RNP) and the frequency allocation of the WCDMA systems.     

CDMA系统中天线系统的调整

在CDMA系统中天线系统的调整对CDMA系统整体性能都会产生影响，本分析了天线系统的干扰和天线系统对小区覆盖的影响，讨论了天线系统的调整在CDMA无线网络优化过程中的应用。