通过优化承载机制提升CS域掉话率问题研究

随着我国WCDMA网络的日臻完善,3G智能终端用户的普及,用户在畅享优质网络时终端处于并发业务成为新常态,并发业务由于PSRAB速率调整及信道迁移等原因,所导致的掉话概率会远高于传统单CS业务,通过理论分析在网络并发业务时控制信道迁移并进行适当限速,可以降低并发业务掉话率.文章以CS域业务掉话率为切入点,通过对并发业务特性进行分析,探索通过优化DRBC策略改善CS域掉话率的方法,从而实现网络CS域掉话率的改善.     

一种基于微服务技术的Web高并发架构

随着互联网业务的快速发展,互联网业务数据流及用户量爆炸式增长,网络业务的兴起对Web架构的高并发性能要求越来越高,为满足高并发、高负载的网络业务需求,Web架构也需要不断迭代更新。文章通过设计基于微服务的Web基础框架,提出基于回归分析的时间预测模型,构建一种基于微服务的Web高并发架构,并通过实验对比分析,验证了本架构的可行性。     

基于大数据的业务并发度分析

指出不同业务之间的关系对于网络优化具有很重要的意义。使用大数据的分析方法处理蜂窝网络的实测数据,可以得到各种业务的并发关系,同时将并发关系通过业务关系网络的方式展现出来,具有很好的可视性。通过业务关系网络可以直接看出业务并发情况,为蜂窝网络的优化扩容等方面提供理论指导。     

WCDMA网络并发业务导致掉话分析与优化

主要针对WCDMA网络并发业务导致掉话问题进行研究,分析出目前CS域掉话率恶化的原因,提出了并发业务中掉话问题的解决思路和方法,通过实际案例进行了效果验证,对处理类似掉话问题具有较好参考价值.     

WCDMA和GSM共同组网互操作技术与策略研究

首先对WCDMA和GSM共同组网互操作技术,如网络驻留、语音业务切换、数据业务重选、并发业务切换、业务与负载控制等进行分析,然后给出具体的选择策略。     

GSM网络语音并发短消息业务研究

GSM网络中,终端空闲态时短消息在SDCCH信道传送,终端通话状态时短消息在SACCH信道传送。GSM网络并行业务(语音并发短消息)如发生切换,按照3GPP协议规范,切换的优先级高于短消息。文章通过对并行业务定点环境验证不同厂家SACCH传送短消息效率,研究参数设置、终端、网络设备机制和连续切换对于语音并发短消息的影响,给出提高GSM网络语音并发短消息成功率可以采取的措施。     

新一代直播卫星位置管理系统高并发设计与实现

新一代直播卫星系统采用了北斗定位管理机制,由于直播卫星业务的高并发访问特性,如何解决海量地理空间信息实时计算分析与高并发实时在线业务运营之间的矛盾,成为了制约新一代业务开展的技术难题.基于此,本文通过对地理信息数据组织、空间索引建立以及计算分析策略等内容进行研究,实现了新一代直播卫星位置管理高并发性、高可靠性、高稳定性...     

GSM网络话音并发短消息业务研究

文章通过对并行业务定点环境验证不同厂家SACCH传送短消息效率,研究参数设置、终端、网络设备机制和连续切换对于话音并发短消息的影响,给出提高GSM网络话音并发短消息成功率可以采取的措施.     

梅州有线数字电视双向网络改造设计

根据梅州有线电视网络现状和业务发展需要,对光纤网络、分配网络和双向化配置方面进行设计,实现网络双向化,增设光节点,扩充网络容量,提高业务接入率和综合并发率。     

XMPP消息系统负载均衡实现方法研究

本文对XMPP系统的部署进行研究,以提供高性能、高并发、高可靠、低成本的方法,以支持百万用户级的业务接入能力。     

基于并发事务逻辑的Web服务编制验证

 服务编制解决的是组织之间的业务集成问题,面临的是一个广泛分布、动态、自治、异构的网络环境,保障组合服务的正确执行以及相关特性的验证问题显得尤为重要.形式化方法是一种有效的解决方法,服务编制需要建立在严格的形式化模型的基础上,可以通过具有明确的、形式化语义的形式化模型研制验证工具来完成组合服务正确性的验证.本文基于并发事务逻辑(CTR:Concurrent TRansaction Logic)对服务编制的元素进行了描述和建模,给出了从WS-BPEL到并发事务逻辑的转换规则,讨论了服务编制在CTR中的验证问题以及WS-BPEL和CTR的表达能力,最后给出了一个实际的服务编制在CTR中建模的例子,验证了服务编制的CTR模型的有效性.     

Evolution of wireless data services: IS-95 to cdma2000

Existing IS-95-based CDMA systems support circuit-mode and packet-mode data services at a data rate limited to 9.6-14.4 kb/s. Fueled by the explosive growth of the Internet, applications and market opportunities are demanding that higher capacity, higher data rates, and advanced multimedia services be supported in the near future. The evolution of the IS-95 CDMA standard to higher data rates and more advanced services occurs in two steps. The first step, IS-95-B, is an enhancement to the IS-95-A standard and offers the highest possible performance without breaking current IS-95-A air interface design characteristics, thereby maintaining strict compatibility with existing base station hardware. The proposed standard will support a high data rate (64 kb/s) in both directions, to and from the mobile device. A new burst mode packet data service is defined to allow better interference management and capacity utilization. The second evolution step, cdma2000, provides next-generation capacity, data rates, and services. The cdma2000 system includes a greatly enhanced air interface supporting CDMA over wider bandwidths for improved capacity and higher data rates while also maintaining backward compatibility with existing IS-95 CDMA end-user devices. The cdma2000 system also includes a sophisticated MAC feature to effectively support very-high-data-rate services (up to 2 Mb/s) and multiple concurrent data and voice services. This article describes the design and performance of the high-data-rate service provided by second- and third-generation CDMA systems     

3G wireless and cdma2000 1/spl times/ evolution in Korea

The cdma2000/spl reg/ I/spl times/EV-DV system is designed to meet the ever-increasing demand for high-speed packet data transmission while providing the same level of revenue generated by conventional voice communications on existing cdma2000 1/spl times/ systems. It supports concurrent voice and high-speed data on a single cdma 1.25 MHz carrier, and offers improved flexibility for operators to manage data and voice services cost efficiently. However, the Korean market has proved that providing higher bandwidth to the user does not guarantee the success of mobile data service. Users tend not to use expensive mobile wireless data services such as video streaming, video on demand, and MP3 music download service that they feel do not provide enough justification for their costs. The problem LG Telecom faces now as a mobile operator is not only to evolve technologies that enable various services, but also to find a way to provide attractive services at reasonable prices. This article describes experiences in the wireless data market in Korea as well as the market needs and driving forces for cdma2000 1/spl times/EV-DV developments.     

Concurrent engineering: The DARPA initiative: encouraging newindustrial practices

The DARPA Initiative in Concurrent Engineering (DICE), is a program launched in 1988 by the US Dept. of Defense's Defense Advanced Research Projects Agency (DARPA) to encourage the practice of concurrent engineering in the US military and industrial base. The overall goal is to develop an architecture for concurrent engineering in which the people working on a project can instantly communicate with each other and access, share, and store up-to-date information in a transient way, unhindered by geographic separation, organizational structure, product complexity, or incompatible tools, databases, and computing resources. The concurrent engineering services are being developed in conjunction with several pilot projects. All the project members belong to `tiger teams', interdisciplinary groups that rove across traditional department boundaries, communicating their insights, making recommendations, and negotiating conflicts     

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 sessions, 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.     

A composite model of product development effectiveness: application to services

This paper explores the extent to which an enlarged, generic version of a "composite" model of concurrent product development previously tested for goods industries also applies to services. The model is comprised of four types of building blocks commonly used in theories of organization design. The operating core of the model includes a troika of practice sets dealing with the organization of cross-functional teams, discipline by structured development processes, and the use of enabling tools/technologies. Concurrent strategy focuses core operations on fast, reiterative cycles of product development. The model postulates that synergy among its constructs have an impact on product development effectiveness. This postulate is tested by multiple regression analysis of 62 large service enterprises in the New York area. All four components of the model had main effects on performance measured as time compression and cost reduction in product development, signature indicators of the effectiveness of concurrent methods of product development. Interaction effects were observed among the constructs of strategy, organization, and process, which suggest synergies. However, tools/technologies lacked significant interactions. With this exception, the results for services parallel those of other studies of goods industries. These findings suggest that concurrent methods of product development are robust, as well as reliable. A generic model of product development is important for managing innovation because goods and services are increasingly commingled in many enterprises and sold as a bundle. Thus, the four building blocks of the model are important for managers to consider deploying in synergistic ways to speed time to market and achieve cost efficiencies.     

一种粗粒度并发程序切片方法

并发程序切片是并发程序分析、理解、调试、测试和维护的重要手段。文章在针对Ada任务机制讨论通信Petri网的基础上，分析了由任务间的同步活动所引起的控制依赖关系，提出了一种粗粒度的切片方法，为人们从较高的抽象层次上理解并发程序提供了一种有效的手段。     

基于ARMl1的3G信息推送系统

设计了一种基于ARMll的3G信息推送系统,在移动网络环境下实现多路并发的短信、电话、传真和互联网信息推送服务。系统由控制台、推送设备和传真服务器组成。介绍了系统的网络结构,提出了系统的总体设计。给出了系统的设计实现,其中包括ARMll平台硬件设计、嵌入式Linux系统软件架构、多业务并发等。样机通过系统测试,实现了大批量、多业务、多通路的移动信息推送服务。     

Capacity plane of CDMA system for multimedia traffic

In a wireless CDMA system for multimedia services, the maximum number of concurrent users satisfying the QoS (Quality of Service) requirements is evaluated in both single-cell and multi-cell environments. A simple upper-bounded hyperplane concept is also formulated to visualise the capacity of a multimedia CDMA system. With this capacity plane, the tradeoffs between the level of system resources needed for a certain user and that needed for others are illustrated, analytically, within the concept of resource management     

Novel Radio Link Buffer Management Schemes for End-User Multi-class Traffic in High Speed Packet Access Networks

The requirement to provide multimedia services with QoS support in mobile networks has led to standardization and deployment of high speed data access technologies such as the High Speed Downlink Packet Access (HSDPA) system. HSDPA improves downlink packet data and multimedia services support in WCDMA-based cellular networks. As is the trend in emerging wireless access technologies, HSDPA supports end-user multi-class sessions comprising parallel flows with diverse Quality of Service (QoS) requirements, such as real-time (RT) voice or video streaming concurrent with non real-time (NRT) data service being transmitted to the same user, with differentiated queuing at the radio link interface. Hence, in this paper we present and evaluate novel radio link buffer management schemes for QoS control of multimedia traffic comprising concurrent RT and NRT flows in the same HSDPA end-user session. The new buffer management schemes—Enhanced Time Space Priority (E-TSP) and Dynamic Time Space Priority (D-TSP)—are designed to improve radio link and network resource utilization as well as optimize end-to-end QoS performance of both RT and NRT flows in the end-user session. Both schemes are based on a Time-Space Priority (TSP) queuing system, which provides joint delay and loss differentiation between the flows by queuing (partially) loss tolerant RT flow packets for higher transmission priority but with restricted access to the buffer space, whilst allowing unlimited access to the buffer space for delay-tolerant NRT flow but with queuing for lower transmission priority. Experiments by means of extensive system-level HSDPA simulations demonstrates that with the proposed TSP-based radio link buffer management schemes, significant end-to-end QoS performance gains accrue to end-user traffic with simultaneous RT and NRT flows, in addition to improved resource utilization in the radio access network.