LTE网络中的寻呼优化方法研究

现有LTE网络中,寻呼是基于TA list进行的.由于实际网络中为UE分配的TA list覆盖范围有限,TA list的作用得不到充分发挥.通过对LTE网络中的寻呼方法进行优化,可减少整个TA list的寻呼次数,减轻LTE网络的寻呼负荷,从而可以进一步扩大TA list的覆盖范围,这样可减少UE的位置更新次数和网络信令负荷,增加UE待机时间.     

TD-LTE系统TA及TAlist规划原则

本文首先介绍了TD-LTE系统位置区的管理机制,其次从TD-LTE系统能力以及目前TD-LTE设备性能等角度,分析了TD-LTE网络的寻呼机制和寻呼容量,最后通过预测LTE小区的用户数目以及单用户寻呼模型,给出了TA/TA list的规划原则和建议。     

PHS网络优化过程中寻呼区的调整

1概述PHS无线通信系统属于微蜂窝系统,在运营过程中,基站的覆盖面积、基站的话务量设计、基站的运营状态以及用户的分布等都会对整个网络的运营状况产生比较大的影响。当用户量达到一定数目时,特别是接近网络设计容量时,可能会由于覆盖面积、话务量资源、频率资源、寻呼区划分不合理等因素而出现网络运营质量下降。针对网络的运营状况进行了解和分析,找出存在的问题,合理地调整基站和寻呼区,改变网络布局,以适应网络发展需要。其中,寻呼区的调整是网络优化的一个重要组成部分。下面将以ZX鄄PCS10郾0系统为例,对PHS网络优化过程中寻呼区…     

高速寻呼系统中的空中接口和联网接口的特点

一、概述目前我国把整个高速寻呼系统划分成以下功能实体：寻呼网络控制中心（ＰＮＣ）、寻呼区域控制中心（ＰＡＣ）、寻呼基站控制器（ＢＳＣ）、寻呼基站（ＢＳ）、人工台与寻呼网管中心（ＯＭＣ）。寻呼网控中心与公众网的接口定义为Ｉ５、Ｉ６；寻呼网控中心之间的接...     

浅析GSM中的空中接口寻呼容量

空中接口的寻呼容量取决于网络参数的设置。CombinedCCCH/SDCCH/4的设置将会使得网络的寻呼容量大大减少。寻呼的瓶颈很容易出现在空中接口上面而导致寻呼被删除。Non-combinedCCCH/SDCCH设置可以大大的加大空中接口的寻呼容量,避免了寻呼瓶颈出现在空中接口上面。寻呼信息需要发送到一个位置区域的所有基站,所以在同一个位置区域的小区,寻呼容量应该要保持一致。     

GSM网络LAC现状分析及解决方案

链路接入控制（LAC）代表一个位置区域,主要有以下两项功能一是在此区域内,网络发起对某个手机的呼叫．此区域内所有的基站都会进行寻呼,因此假如一个LAC涵盖的基站数过多,用户数过多,大量的寻呼将导致基站收发信台（BTS）寻呼负荷过载。二是手机进入一个新的LAC服务范围内,必须发起请求,更新归属位置寄存器（HLR）及访问位置寄存器（VLR）内的位置记录,因此网络的LAC数过多．会造成手机频繁的位置更新,浪费相应的信令资源。     

小灵通基站地理信息系统的设计与应用

小灵通基站地理信息系统是在Maplnfo平台支持下,应用MapBasic和VB开发语言,通过访问远程Oracle数据库,对数据进行分析处理,使告警基站、异常基站数据在电子地图上可视化,并提供了小灵通基站的规划信息,包括网关信息、寻呼区信息、局向信息和基站信息,同时系统还提供了目前网络的话务、覆盖、容量、干扰四类专题地图功能,从而为基站规划、告警处理、网络优化、专题分析提供了实时性地理化信息。     

解决基站丢失寻呼消息的措施

经过对南宁基站丢失寻呼消息相关话务统计数据分析,阐述立即指派对寻呼的影响,以及通过试验修改MFRMS（寻呼复帧）参数确定减小MFRMS可以较大幅度的降低基站丢失寻呼消息的风险,最后指出了必须采取开源节流等优化措施才能从根本上解决CCCH（公共控制信道）拥塞问题,最终解决基站丢失寻呼消息问题。     

TD-LTE网络的TA、TAList规划研究

LTE系统采用跟踪区（Tracking Area）对UE的位置进行管理。TA的功能与路由区（Routing Area,RA）类似。MME通过TA确认UE的位置,并通过TA对UE进行寻呼。做好TA、TAList的规划,可以避免寻呼过载、互操作感知差等问题。     

采用多基站同播方式的无线寻呼系统

本文介绍了两种采用多基站同播方式的无线寻呼系统；单寻呼终的简单系统和多寻呼终端的区域覆盖系统，并对多基站同播系统中的时延匀衡技术进行了介绍，最后给出摩托罗拉公司ＰＵＲＣ５０００型同步寻呼发射机实例。     

Joint Processing Precoding for Coordinated Multi-Point Transmission in LTE-A

Coordinated Multi-Point (CoMP) transmission is a technology targeted for Long Term Evolution Advanced (LTE-A).It is designed to reduce cell-edge interference,improve cell-edge spectrum efficiency and enlarge effective cell-edge coverage by means of multi-point coordination including coordination between Remote Radio Units (RRUs) within an eNodeB,coordination between an eNodeB and its relays,and coordination between eNodeBs.The Joint Processing (JP) technique for CoMP can maximize system performance,which is...     

A dynamic paging scheme for long‐term evolution mobility management

In long‐term evolution, the service area is partitioned into several tracking areas (TAs), which comprise one or more cells (the radio coverages of base stations). The TAs are grouped into TA list (TAL). When an incoming call arrives, the network attempts to connect to the user equipment (UE) by paging the cells in the UE's TAL, which may incur large paging traffic that significantly consumes the limited radio resources. To resolve this issue, this paper proposes a dynamic paging scheme that determines the paging sequence of cells in real time according to the UE movement and call behavior. We compare the performance of the dynamic paging with that of the previously proposed Cell‐TA‐TAL (CTT) paging. Our study indicates that the dynamic paging outperforms the CTT paging when movement pattern is regular and the UE moves frequently. Copyright © 2013 John Wiley & Sons, Ltd.     

SIP Paging and Tracking of Wireless LAN Hosts for VoIP

This paper introduces a new paging technique to track and wake up a mobile node (MN) attached to an access point (AP) in a wireless LAN network after a session initiation protocol (SIP) INVITE message is initiated by a caller. A tracking agent (TA) keeps track of the mobiles' handoffs between the APs. A paging agent (PA) triggers the TA to page the mobile when a SIP INVITE is received for one of its users. The context transfer feature of our paging protocol allows the paging messages to deliver the station context in order to enable faster session reestablishment. The AP then does onlink paging in a wireless link. SIP extensions are needed to trigger the PA to start paging MNs to notify their dormant status using an extended SIP REGISTER method. Tracking protocol is analyzed to compare soft- and hard-state approaches for state inconsistency ratio, message rate, and the overall cost. The simulation model we developed enables us to evaluate the traffic introduced by the tracking protocol and the cache (state) size. Paging protocol is analyzed for CPU processing times and the transmission delays in the SIP session setup with paging. Simulation of the paging with context transfer is used to show the gains in reauthentication.     

Effective paging procedure for the optical feeder microcellular system

The paper considers a paging problem in the optical feeder microcellular system where group simulcasting and dynamic channel allocation technologies are incorporated. The objective is to propose an effective paging procedure whose performance is measured in terms of paging load, average paging delay, and paging success probability. In the paging procedure, paging signals are transmitted via group simulcasting, for which the control channel is allocated dynamically. The performance of the procedure is analyzed in an approximate queueing network model. The proposed procedure is then compared in performance with a simulation approach, from which the procedure is found to outperform any previous methods in the literature.     

A crossing-tier location update/paging scheme in hierarchical cellular networks

Location update/paging strategies have been widely studied in the traditional single-tier cellular networks. We propose and evaluate a novel crossing-tier location update/paging scheme that can be used in a hierarchical macrocell/microcell cellular network. Location update is proceeded only in the macrocell tier, where a location area (LA) is made up by larger macrocells. A mobile user will stay in such a LA for longer time. Therefore, the cost on location update can be reduced due to the decreased frequency of location update. To reduce the paging delay, the paged mobile user will be searched in the macrocell tier only when the paging load is not high. Otherwise, it will be searched in the microcell tier, where a sequential searching method is applied. The operation for the scheme is simple, as the macrocell/microcell cellular network has the advantage because a mobile user can receive a signal from both a microcell and the overlaid macrocell. Analytical models have been built for cost and delay evaluation. Numerical results show that, at relatively low cost, the crossing-tier scheme also achieves low paging delay.     

LTE传输安全组网技术及规划要点

在LTE网络中,eNodeB回传采用IP分组承载传送网。IP网络除了简单灵活、扁平化、完全开放等特点外,还使承载的业务面临各种信息安全问题。通过详细分析802.1x、IPSec、SSL和PKI等传输安全关键技术,提出了不同层次的传输安全保护组网建议,以解决eNodeB与EPC核心网之间的通信安全问题。     

基于GSM900M升级的EDGE＋＋应用及评估

EDGE＋＋的本质是FDD-LTE技术,可以通过升级农村的GSM900M且在共用现网TD-LTE的核心网、PTN传输网基础上改造完成。硬件上,将GSM900M的RRU替换为EDGE＋＋的RRU,BBU侧增加EDGE＋＋的基带处理板和主控板,GSM900M的天馈资源无需替换。软件上,通过Refarming GSM工具清理出农村的空闲频率5M,升级EDGE＋＋的eNodeB的软件版本,修改GSM900M的BTS的相关模式,联调EDGE＋＋的eNodeB,打通EDGE＋＋的eNodeB到EPC之间的PTN传输通道,完成eNodeB站点业务调测。最后,将EDGE＋＋信号通过支持EDGE＋＋的MiFi或CPE终端转换成Wi-Fi信号,在农村提供Wi-Fi热点。     

浅析eNodeB设备的硬件维护

通过对TD-LTE网络无线侧维护及研究,分析TD-LTE网络构成和基站硬件特点,讨论目前站点常见的各类故障产生原因,并对其进行分类和总结。将eNodeB常见硬件故障原因分为时钟类、天馈类和传输类故障,并说明现场处置经验,阐述不同类型故障的排查原则和定位思路,为eNodeB硬件故障排查提供了参考。     

TD-LTE中家庭基站的干扰管理

据预测在LTE网络中将有超过80%的数据业务发生在室内,因此室内覆盖对LTE通信网来说很重要。家庭基站是近年来新兴的室内覆盖技术。针对引入家庭基站的TD-LTE系统,文中分析了其存在的干扰场景,之后针对各种干扰场景给出相应的干扰管理策略,并详细介绍了3GPP R10中开发的毫微微小区（femtocell）增强型小区间干扰协调（eICIC,enhanced Inter-Cell Interference Coordination）技术,最后给出今后的研究方向。