中国市场应用是TD-SCDMA成功的首要战略契机——访TD-SCDMA产业联盟秘书长杨骅先生

中国的电信市场无论从用户数还是从设备投资总额来讲都是世界上最大的单一国家市场，巨大的市场是推动中国通信技术进步的战略资源，TD-SCDMA在中国实现商用是实现中国自主创新战略目标的一个关键环节。 这个问题之所以重要，因为市场应用是检验和推动技术进步的必要条件，承载新技术的产品只有被市场接纳，实现销售收入，才能够形成研发和生产的良性循环；技术只有在实际的市场规模应用中才能够发现问题，并针对市场的实际需求进行改进，成为成熟的商用产品。     

政策逐步收紧网吧市场面临重新洗牌

文化部大幅提高对网吧行业整治力度。文化部日前向各省市文化市场主管机构下发通知，要求加大对网吧接纳未成年人违法行为的处罚力度。根据新发布的政策，网吧一次接纳3名以上未成年人，将被吊销《网络文化经营许可证》。     

政策逐步收紧网吧 市场面临重新洗牌

文化部大幅提高对网吧行业整治力度。文化部日前向各省市文化市场主管机构下发通知，要求加大对网吧接纳未成年人违法行为的处罚力度。根据新发布的政策，网吧一次接纳3名以上未成年人，将被吊销《网络文化经营许可证》。     

无线移动网中呼叫接纳控制模型分析

新一代无线网应该能够同时支持传统的数据业务和实时交互式多媒体业务，并能够为用户提供QoS保证。在无线网中提供QoS保证，呼叫接纳控制扮演着重要的角色。对已有的呼叫接纳控制方面的研究成果进行了归纳、总结和分析，以期得出适合于无线移动多媒体网络的呼叫接纳控制模型。为适应当前的多媒体应用，侧重于对和适应性带宽分配相结合的接纳控制模型的分析。另外，介绍了与价格机制相结合的接纳控制模型，经济学概念的引入，为我们解决问题提供了一种新的视角。     

提供延迟保证服务的资源优化配置方法

基于利用率的接纳控制方法有效地解决了延迟保证服务中的可扩展性问题。这种方法通过配置阶段的延迟演算技术，确定可保证实时应用端到端延迟的每条链路最大可配置带宽数量，将实时的延迟保障测试简化为简单的带宽利用率的检测。然而，如何优化资源配置以提高预分配带宽资源的使用效率是基于利用率方法要解决的重要问题。文章提出一种基于路径的资源配置方法，可有效保证预分配带宽资源在运行阶段被充分使用，减少资源浪费。通过实验验证，发现基于路径的资源配置方法比传统的一致的配置方法能达到更高的接纳概率和有效资源利用率。     

NGN中资源接纳控制研究进展

下一代网业务控制和传送功能相分离后，为了保证业务的服务质量（QoS），引入了资源接纳控制的概念。通过实行资源接纳控制，资源接纳控制子系统（RACS）向上向业务层屏蔽传送网络的具体细节，支持业务控制与传送功能相分离；向下感知传送网络的资源使用情况，确保正确合理地使用传送网络资源，从而保证业务的服务质量（QoS），并防止带宽和业务盗用现象发生。功能架构、涉及的实体和参考点、接入类型和终端、资源控制模式、功能实体之间的选择机制、不同域之间的互联、和传送控制功能中其他功能之间的交互是资源接纳控制的核心内容。由于TISPANRACS和DITU—T资源接纳控制功能（RACF）的研究重点有差异，因此统一不同组织定义的架构将是各个组织今后研究的重点。     

异构无线网络中基于马尔可夫决策过程的区分业务接纳控制的研究

对异构无线网络中区分业务类型的接纳控制机制进行研究.分析了语音和数据2种典型业务在CDMA蜂窝网络和WLAN中的容量区域.基于马尔可夫决策过程理论,提出异构无线网络中区分业务类型的接纳控制理论模型,规定了不同类型业务的接纳控制行为并推导了系统状态转移概率.而且,进一步从用户角度对不同类型业务QoS要求和网络状态之间关系进行分析,提出一种基于模糊逻辑的接纳效用评估机制,在保证各类业务接入和切换成功率的基础上,推导出接纳效用最大的最优接纳控制策略.仿真表明,基于模糊逻辑的接纳效用评估能够有效反映网络状态动态变化对接纳控制的影响,最优接纳控制策略在平均接纳效用方面明显优于不考虑业务区分和用户移动性2种接纳控制机制,并且能严格保证各类业务的接入和切换成功率.     

电话机、呼叫方式及其信令系统

本文研究了用于移动/无线网络的,具有服务质量(QoS)保证和动态信道分配的分布式接纳控制的性能。首先给出了采用动态分配信道的接纳控制的 QoS测度,之后导出了分布式呼叫接纳控制准则。所得结果给出了对于具有 QoS 保证的分布式接纳控制由最佳动态信道分配方案可得到的最佳的性能。参10     

WiMAX在全球有24个网络进入商用阶段

从2006年年初以来，WiMAX在美国、欧洲、亚太甚至南美和阿拉伯等国家和地区逐渐升温，从政府部门、监管机构到运营商，都有积极的动作，使得WiMAX技术的施行和应用有了实质性的进展。目前给人的主要印象是，具有一定技术优势的WiMAX人气日高，已经被广泛接纳；亚洲将会成为WiMAX的重要市场；WiMAX将逐渐走向成熟，形成坚实的产业链，并降低成本；WiMAX和3G各有所长，互为补充，不会威胁3G的发展；作为目前最大问题的WiMAX全球频率协调问题，也不会阻挡WiMAX前进的步伐。     

WiMAX开始在全球部署

从2006年年初以来，WiMAX在美国、欧洲、亚太，甚至在南美和阿拉伯国家等都在逐渐升温，从政府部门、监管机构，到运营商，都有积极的动作，使得WiMAX技术的施行和应用有了实质性的进展。目前给人的主要印象是，具有一定技术优势的WiMAX人气日高，已经被广泛接纳；亚洲将会成为WiMAX的重要市场；WiMAX将逐渐走向成熟，形成坚实的产业链，并降低成本；WiMAX和3G各有所长，互为补充，不会威胁3G的发展；作为爵前最大问题的WiMAX全球频率协调问题，也不会阻挡WiMAX前进的步伐。     

A framework for reconfigurable computing: task scheduling andcontext management

Dynamically reconfigurable architectures are emerging as a viable design alternative to implement a wide range of computationally intensive applications. At the same time, an urgent necessity has arisen for support tool development to automate the design process and achieve optimal exploitation of the architectural features of the system. Task scheduling and context (configuration) management become very critical issues in achieving the high performance that digital signal processing (DSP) and multimedia applications demand. This article proposes a strategy to automate the design process which considers all possible optimizations that can be carried out at compilation time, regarding context and data transfers. This strategy is general in nature and could be applied to different reconfigurable systems. We also discuss the key aspects of the scheduling problem in a reconfigurable architecture such as MorphoSys. In particular, we focus on a task scheduling methodology for DSP and multimedia applications, as well as the context management and scheduling optimizations     

BIST TPG for Combinational Cluster Interconnect Testing at Board Level

A novel built-in self-test (BIST) architecture and a test pattern generator (TPG) design methodology to program this architecture are presented for inter-IC interconnects among combinational non-boundary scan ICs (often called cluster-ICs) via IEEE 1149.1 boundary scan architecture (BSA). Due to the expense and complexity of BSA circuitry, cluster-ICs are still widely used in modern circuit boards. Since combinational logic and 3-state cluster nets exist within cluster interconnect, in order to test all detectable faults in inter-IC nets that include cluster-ICs, newly identified TPG requirements are used to guarantee fault coverage during the design of proposed BIST architecture. This architecture contains a two-level C-TPG that generates constrained pseudo-random patterns for boundary scan cells (BSCs) of cluster control cones, a D-TPG that generates patterns for BSCs of cluster data cones, and a look-up table which is programmed to select, for each BSC, a specific C-TPG or D-TPG stage whose content is shifted into that BSC. This test architecture provides a true BIST solution for cluster testing. The proposed methodology generates TPGs that (i) guarantee the avoidance of multi-driver conflicts when testing via BSA, (ii) guarantee the detection of all testable interconnect faults, (iii) have low area overheads, and (iv) have short test lengths.     

A software architecture for GPRS session management

General packet radio service (GPRS) provides efficient access to the integrated services Internet from wireless networks. When the GPRS‐attached mobile station attempts to send or receive data, a packet data protocol (PDP) context shall be established. The GPRS session management (SM) supports the PDP context handling, which consists of PDP context activation, deactivation, and modification procedures. In this paper, we propose an SM software architecture for the serving GPRS support node. Our design goals are to achieve compatibility, modularity, and flexibility. More importantly, our approach can accommodate the design of the SM software architecture for third‐generation wireless networks. Copyright © 2001 John Wiley & Sons, Ltd.     

NAVDAT接收机硬件设计

叙述了一种基于直接采样架构的NAVDAT接收机设计及实现方案,详述了射频及基带的设计重点,并对接收机硬件进行了初步测试。该方案灵活性强,拓展性好,是后续多系统综合航保一体机设计的基础。     

基于VPR的层次式FPGA结构描述方法研究

针对层次式FPGA结构设计的需要,提出一种基于VPR的FPGA结构文件描述方法.该方法可以描述多种层次式FPGA的系统结构,实现同VPR布线功能的集成,方便进行FPGA结构设计的验证.实验证明,该结构描述方法具有较好的灵活性和一定的通用性,并能够应用在FP-GA物理设计和新结构的设计过程中.     

一种变时间常数自动增益控制环路与算法设计

针对时间常数恒定的自动增益控制环路的不足,设计了一种时间常数可变的自动增益控制结构,实现了环路响应时间能够自适应地随着输入信号的增大而减小,在一定程度上克服了恒定时间常数自动增益控制环路的不足。给出了其核心算法并进行了详细推导,在理论上证明了该结构的稳定性以及算法的有效性。最后,对提出的结构以及算法进行了仿真。仿真结果表明,本文所设计的结构与提出的算法既能对大电平信号迅速响应,又能保证足够小的反调制失真。     

一种动态可重构协处理器参数化系统级模型研究

提出了参数化系统级模型.该模型不依赖于具体结构,以任务布局与重构处理分离的两级结构处理任务调用,通过参数方式实现不同设计方案的硬件结构和布局算法的配置.采用SystemC语言对模型进行了建模验证,仿真结果表明,通过指定上下文的下载、配置和执行等时间开销参数,在系统级设计空间探索中,能很好地模拟动态重构协处理器.     

Congestion control mechanisms and the best effort service model

In the last few years there has been considerable research toward extending the Internet architecture to provide quality of service guarantees for the emerging real-time multimedia applications. QoS provision is a rather controversial endeavour. At one end of the spectrum there were proposals for reservations and per-flow state in the routers. These models did not flourish due to the network's heterogeneity the complexity of the mechanisms involved, and scalability problems. At the other end, proposals advocating that an overprovisioned best effort network will solve all the problems are not quite convincing either. The authors believe that more control is clearly needed for protecting best effort service. An important requirement is to prevent congestion collapse, keep congestion levels low, and guarantee fairness. Appropriate control structures in a best effort service network could even be used for introducing differentiation. This could be achieved without sacrificing the best effort nature of the Internet or stressing its architecture beyond its limits and original design principles. We revisit the best effort service model and the problem of congestion while focusing on the importance of cooperative resource sharing to the Internet's success, and review the congestion control principles and mechanisms which facilitate Internet resource sharing     

Impact of new chip technologies on telecommunications

Microelectronics has revolutionized the architecture and design concepts of telecommunications products dramatically. Its strength is based on the combination of three different disciplines: technology, design automation and device architecture. The evolution in all these topics will be described and illustrated with several examples of telecommunications applications. At present vlsi circuits are used in three important business segments of the telecommunications market: switching, transmission and end-user systems. The technology requirements for these applications are followed by a brief discussion on reliability requirements and future technology trends.     

Middleware: Context Management in Heterogeneous, Evolving Ubiquitous Environments

Mobile computing environments are characterized by heterogeneity—systems consisting of different device types, operating systems, network interfaces, and communication protocols. In a realistic scenario of context-aware computing, we should be able to deploy context management middleware throughout the distributed system at every device, despite its resource limitations, and the developer should be able to evolve the context model whenever new context-aware applications or context providers are introduced. This article presents a middleware architecture and design strategies that address these requirements without compromising efficiency.