DS-CDMA system outer loop power control and improvement for multi-service

When a new user accesses the CDMA system, the load will change drastically, and therefore, the advanced outer loop power control （OLPC） technology has to be adopted to enrich the target signal interference ratio （Silt） and improve the system performance. The existing problems about DS-CDMA outer loop power control for multi-service are introduced and the power control theoretical model is analyzed. System simulation is adopted on how to obtain the theoretical performance and parameter optimization of the power control algorithm. The OLPC algorithm is improved and the performance comparisons between the old algorithm and the improved algorithm are given. The results show good performance of the improved OLPC algorithm and prove the validity of the improved method for multi-service.

SERVICE-AWARE BASED FUZZY ADMISSION CONTROL SCHEME IN MULTI-SERVICE NETWORKS

Multi-service aggregated transmission is the direction of IP network. Providing different Quality of Service (QoS) assurance for different services has become a crucial problem in future network. Admission control is a vital function for multi-service IP network. This paper proposes a novel fuzzy admission control scheme based on coarse granularity service-aware technique. Different service has discriminative sensitivity to the same QoS characteristic parameter in general. The traffic class can be perceived by the service request parameter and the proposed QoS function. And requirements of dif- ferent applications can be met by maintaining the life parameter. From simulation results, the proposed scheme shows a better QoS provisioning than those traditional fuzzy logic based methods under the same admission probability.

Study on Task Assignment of Two-stage Multi-service Capability Port Logistics Service Providers

This paper mainly studies the problem of multi-task assignment of providers in port logistics service supply chain.As a core enterprise,port plays the role of logistics service integrator.With the continuous development of industrial integration,logistics service providers not only provide one kind of logistics service,but also develop into composite suppliers who capable of providing a variety of logistics services.This paper studies the task assignment problem of multi-service capability providers in the port logistics service supply chain.The two-stage logistics service provider task assignment model was built,which is based on the mixed evaluation method(including MOORA and FMEA)and the multi-objective planning method.Eventually,the effectiveness of the model method was verified by combining with an example.

COMBINED ADMISSION CONTROL AND SCHEDULING IN MULTI-SERVICE NETWORKS

Providing the required metrics for different service respectively is a basic characteristic in multi-service networks. The different service can be accessed and forwarded differently to provide the different transmission performance. The state information between admission control and scheduling can be exchanged each other by the defined correlation coefficient to adjust the flow distribution in progress. The priority queue length measured by scheduler implicitly can describe the priority flows load. And the fair rate can describe the non-priority flows load. Different admission decision will be made according to the state of scheduler to assure the time-delay upper threshold for the priority flows under heavy load and the fairness for elastic flows in light load, respectively. The stability condition was conduced and proved. Simulation results show the policy can ensure both the delay for the priority flows and the minimal throughput for non-priority flows.

THE STUDY OF SCP OVERLOAD CONTROL IN MULTI-SERVICE ENVIRONMENT

This paper first gives a SCP abstract model, then SCP’s overload detection and maximum processing capability are discussed quantitatively. Based upon dynamic adjustment, a new two-level SCP overload control algorithm is proposed. Theoretical analysis and simulation prove the algorithm’s effectiveness and fairness.

DESIGN OF MULTI-SERVICE SDH NETWORKS: FORMULATION AND HEURISTICS

Multi-service SDH networks support both packet- and circuit-switched traffic. Optimal design of such a network means to guarantee the circuit connections and configure a logical packet-switched topology with lowest congestion. This letter first formulates the problem as a mixed integer linear programming, which achieves optimal solution but has high computation. Then a heuristic algorithm is proposed to yield near-optimal solution efficiently. Performance of the algorithm is verified by an example.

STUDY ON THE ACCOUNT-SHARING STRATEGY FOR MULTI-SERVICES IN IMS ONLINE CHARGING MECHANISM

A prepaid subscriber is allowed to simultaneously implement multiple services in online charging mechanism of IP Multimedia Subsystem (IMS). It is a noteworthy discussion to effectively distribute the limited account resources among concurrent services. An account-sharing algorithm is proposed for multi-services,which introduces resource reclamation and redistribution processes based on the resource reservation of standard specifications and dynamically adjusts them according to the changes of Quality of Service (QoS). Three performance indexes are investigated in the simulation experiments, which are average number of accommodated sessions, average number of completed ses- sions, and average number of iterations per accommodated session. The results show that in the normal QoS level, the three indexes of the proposed algorithm averagely increase by 18.7%, 5.4%, and 3.1% compared with the Prepaid Credit Distribution (PCD) algorithm, and by 2.1%, 1.0%, and 1.8% compared with the Prepaid Credit Reclaim (PCR) algorithm. In the poor QoS level, the performance advantages are greater, which averagely increase by 29.1%, 7.1%, and 2.8% compared with PCD, and by 9.4%, 4.1%, and 3.6% compared with PCR.

Echo-state-network classification based multi-services awareness in high-speed optical passive networks

With the challenge of great growing of services diversity,service-oriented supporting ability is required by current high-speed passive optical network( PON). Aimed at enhancing the quality of service( Qo S) brought by diversified-services,this study proposes an echo state network( ESN)based multi-service awareness mechanism in 10-Gigabite ethernet passive optical network( 10GEPON). In the proposed approach,distributed architecture is adopted to realize this ESN based multi-service awareness. According to the network architecture of 10G-EPON,where a main ESN is running in OLT and a number of ESN agents works in ONUs. The main-ESN plays the main function of service-awareness from the total view of various kinds of services in 10G-EPON system,by full ESN training. Then,the reservoir information of well-trained ESN in OLT will be broadcasted to all ONUs and those ESN agents working in ONUs are allowed to conduct independent service-awareness function. Thus,resources allocation and transport policy are both determined only in ONUs. Simulation results show that the proposed mechanism is able to better support the ability of multiple services.

基于Petri网的多播组动态管理协议IGMP的形式化分析

文中在对IGMP详细的机制分析的基础上用扩展的库所 变迁网对其进行了形式化的描述 ,从而奠定了IGMP协议分析和具体实现的基础。

IGMP Snooping协议实现方案

研究并实现了以太网交换机上基于组播VLAN的IGMPSnooping协议。该方案通过监听IGMP消息以得到各端口组播信息 ,从而维护组播信息状态机 ,并利用这些信息来建立相应的组播VLAN。同时该方案在状态机中还实现了IGMP代理 ,避免了“IGMP风暴”。该设计方案已成功运用于某项目高速以太网交换机中。

基于加密接入令牌的IGMP安全机制

在 IP组播中当前使用的组管理协议 IGMP不提供接入控制 ,任何端点用户可自由地加入组播组 ;此外 ,IGMP报文在传输时没有加密措施 ,无法保证其安全性 .因此 ,对 IGMP报文的认证和接入控制策略便成为亟待解决的重要课题 .在 IGMP报文后附加接入令牌的方法虽然可以解决 IGMP协议存在的一些安全问题 ,但其仍存在一些缺陷 .在此基础上 ,提出了一种加密接入令牌的方法 ,阐述了如何申请、产生、传输和使用令牌 .加密接入令牌可以安全的传输认证和接入控制信息 ,并且可以多次使用 ,不需要在用户和组播路由器之间建立安全关联 SA。

IGMP snooping技术原理及实现

随着网络技术的发展,目前常用的网络传输模式已不能满足实时信息交互的需求.为了解决网络瓶颈的问题,本文提出了将IGMP snooping技术应用于网络中,阐明了IGMP snooping的原理,并给出了具体的实施方案、主要数据结构以及IGMP报文处理方法.该实施方案可靠性高,最优化程度好.随着用户需求的不断增加,IGMP snooping技术将会应用于更多的领域.

EPON系统中IGMP Proxy技术实现方案

提出了一种基于VLAN的EPON系统组播实现方案,满足当前宽带接入网中有效传输组播业务的需求。该方案充分利用ONU端的IGMPProxy技术,大大降低了IGMP控制报文在EPON系统、上端核心网中的流量。仿真显示了该方案在IGMP控制报文网络流量上的性能大幅提高和优越性。

因特网组管理协议IGMP研究

IGMP是组播实现中重要的组管理协议。分析了现有的三个版本的IGMP协议,研究了其工作原理、报文格式和协议特点,以及IGMPv3协议对源特定组播的支持。

IGMP协议一致性测试研究与实现

在介绍IGMP协议的基础上 ,结合高端路由器开发的工程实践 ,介绍了IGMP一致性测试系统的结构 ,给出测试方法、案例生成和测试集结构 ,最后介绍了利用此系统进行的实际测试执行。

IGMP V3协议研究与实现

针对IPV4下Windows 2000系统不支持指定源组播模型的问题,通过对3个版本IGMP（互联网组管理协议）的分析研究,采用原始套接字截获IGMP V3查询包,模拟生成组成员关系上报电文的方法,达到了欺骗交换机/路由器、维持其组成员关系的目的,解决了Windows 2000终端设备无法实现指定源组播通信的难题。仿真测试以及实际应用表明,这种方法完全可以应用于不支持IGMP V3协议的其他系统。

用IGMP窃听与代理在交换式以太网上实现IP组播

提出了一个高效的IGMP窃听与代理方案来实现交换式以太网上的IP组播,并详细描述了其实现细节,可以用来指导实现一款高性能的支持IP组播的以太网交换机.

IGMP Snooping在EPON中的实现方案

阐述一种利用VLAN划分组播域,依靠侦听IGMP消息来维护组播VLAN表的IGMP Snooping实现思想。提出该思想在EPON上的基于MAC层和RS层2大类共6种实现方式。指出当前研究成果中存在的协议鲁棒性问题并给出针对数据存储和运行流程上的修改建议。得出一种无明显缺陷并克服鲁棒性问题的最优方案。

基于SSM模式的IGMP snooping设计与应用

针对ASM(Any Source Multicast)模式在组播业务中对访问控制机制的不足,讨论基于源特定地址组播SSM(Source Specific Multicast)模式和支持该模式的IGMPv3协议,并在以IPTV部署为应用背景的IPDSLAM系统中实现支持IGMPv3协议的IGMPsnooping功能,初步完成对IPTV源频道(组播业务)的访问控制管理机制。

基于IGMP的家庭网关固件升级系统的设计与实现

随着中国社会信息技术和网络技术的快速发展,电信运营商将面临海量家庭网关产品的运维管理场景。文章基于IGMP原理,提出一种采用组播技术的家庭网关设备固件和XML配置升级的实用解决方案。详细介绍组播升级方案涉及的技术要点,并更新设计IGMP处理状态机,提供升级场景的配置及功能测试情况,为电信运营商平稳、快速地升级相应设备的软件版本和XML配置等运维管理工作,提供了有益借鉴。