LTE系统中多业务优先级调度算法的设计

LTE系统中存在单用户同时申请多种并发业务,多用户申请不同业务的混合业务场景,为此,3GPP在现有UMTS的基础之上对QOS机制进行了更细的业务划分和优化,但现有调度算法沿用UMTS的Qo S机制,没有区分不同业务类型的特点,难以体现用户的差异化调度。为此,本文在M-LWDF算法的基础上提出了结合新Qo S机制的混合业务分组调度算法,并对改进算法进行仿真验证。结果表明,所提出的改进算法能在牺牲少量公平性的代价下,较大程度的减少系统的分组时延与丢包率,满足不同业务的差异化调度需求。     

一种基于CoMP的随机接入方案

提出了一种新的基于协作多点传输和接收（CoMP）技术的多发随机接入流程,并根据 随机接入的目的和业务类型设计了接入优先级,在此基础上设计了一种新的随机接入方案, 对 不同类型的随机接入请求提供不同的接入机制,以保证边缘用户的接入性能和满足不同业务 的QoS需求。仿真结果表明,与LTE标准随机接入方案相比,该方案对系统整体接入性能略有 提高,且大大提高了边缘高优先级用户的接入性能。     

多用户OFDM系统的次最优分配算法

本文提出了一种多用户OFDM系统中次最优的自适应载波、比特和能量分配算法。此算法利用各子载波的瞬时特性,在保证各个用户服务质量(QoS)的前提下,通过合理地分配子载波并调整各个子载波调制等级,达到降低总发射功率的目的。该算法相对于最优算法具有简单、公平、高效的特点。仿真实验表明,该算法的性能接近最优算法。     

认知无线网络中基于业务区分的自适应MAC协议

为了提高认知用户的接入效率,同时兼顾其QoS需求,提出了一种应用于认知无线网络的基 于业务区分的自适应MAC协议。对不同业务采取 不同的最优频谱检测时间,实时业务(RT)以最小化接入时延为目的确定最优的 频谱检测时间,而非实时用户(NRT)则以最大化吞吐率为目标确定最佳的频 谱检测时间。根据所确定出的最佳频谱检测时间,结合当前的业务到达速率和调度策略,不 同业务以时隙Aloha的方式接入空闲频谱。理论分析和仿真表明,所提出的自适应MAC协议能 够自适应地为认知用户的不同业务确定最优频谱检测时间,从而有效地提高频谱使用效率, 保证不同业务的QoS需求。     

分组域核心网的动态QoS机制浅析

QoS差异化是一种对用户和业务分类，并进行不同的处理和监控的方法。诺西的动态QoS控制机制，业务带宽管理和基于业务的QoS方案，提供了很好控制手段。可以灵活地对不同业务进行不同Qos设定，进行带宽的限制。     

一种移动无线网络分组公平调度算法

提出了一种支持时延限制的无线多媒体流公平调度算法。算法根据无线信道的服务质量，动态调整该信道连接的业务速率，并根据各个业务请求当时的时延因子的大小来公平地补偿和再分配带宽。仿真验证了算法的可行性和科学性。支持对时延敏感的流和对差错敏感的流，能做到区别补偿调度，满足各自的QoS需求。     

一种支持VoIP语音高优先级传输的WLAN系统设计

针对无线局域网（WLAN）多址接入的特点以及VoIP业务自身的质量要求，提出了一种设计方法，将上下行数据发送分离，支持实时业务的上下行对等传输，同时通过一种改进的早期随机检测（RED）算法，实现基于语音抖动参数的流量控制，为语音业务提供QoS保证。     

IP QoS综合服务模型研究

本文讨论了一种资源预留和QoS控制模型。对该模型中的接纳控制、策略控制和调度算法进行了分析,并且讨论了模型的核心协议－资源预留协议（RSVP）,从讨论中可以看到,该模型能在IP网上提供不同级别的QoS以满足不同的需求。     

SWAN模型速率控制模块性能分析及改进

SWAN是Ad Hoe网络中的一种无状态网络协议，利用分布式控制算法来传递分类服务。这种QoS模型把数据业务分为两类进行不同处理，即对尽力而为的UDP和TCP业务采用速率控制的策略而对实时的UDP业务采用基于源节点的接纳控制策略。本文修改了SWAN模型的速率控制模块，引入队列调度机制，对从上层来的尽力而为数据包进行排队、调度，使其尽可能公平地占用新到资源。在分析中具体给出了修改后速率控制模块的实现过程。通过仿真分析了AIMD算法的参数对修改后速率控制模块性能的影响。     

网络服务质量保证技术IP QOS现状分析

本文主要介绍了随着Internet和各种业务的迅猛发展,现在的网络服务质量保证明显滞后业务发展需求。为了解决现状,通信行业业界提出了IP Qos概念,其主要技术方案为：IntServ、DiffServ、IntServ与DiffServ结合、MPLS＆QoS、MPLS—TE＆QoS、带宽管理等及它们相应的不足之处,然后提出了目前在IP QoS领域需要重点关注的一些问题。     

Which consumers are willing to pay for smart car healthcare services? A discrete choice experiment approach

The technology adoption lifecycle model categorizes consumer groups in the new concept products and services market, based on different characteristics and needs, into innovators, early adopters, early majority, late majority, and laggards, in order of adopting new products and services. This study aims to estimate heterogeneous consumer preferences and willingness to pay for a new concept convergence service, the smart car healthcare service, using a choice experiment questionnaire and a hierarchical Bayesian mixed logit. We found that consumers were willing to pay an additional 3000 to 6000 KRW/month (2.65–5.29 USD/month) for a service that measured both physical movement and vital signs compared to either the former or the latter. It was also found that they were willing to pay about 3000 KRW/month (2.65 USD/month) more for a service that provides health condition predictions compared to one that provides only the current health condition. In addition, customers who were young, innovative, and favored the utility of healthcare services showed a lower sensitivity to service fees than those who were not. Thus, they were found to have a greater willingness to pay for advanced smart car healthcare services.     

面向O2O的Web服务描述与建模

针对现有服务描述只考虑网上Web服务功能与质量属性,忽视用户网下服务需求的弊端.基于O2O环境中用户对网上服务和网下服务的综合需求,这篇文章对传统的Web服务描述进行了扩展,构建网上网下服务描述模型,设计了网上服务和网下服务的FQoS和QoS指标体系,定义了QoS属性的量化公式,建立了服务资源本体元模型,实现了对服务资源全面整体的描述,解决了网上服务和网下服务功能质量协同的问题.具有较强的理论意义和现实意义.     

相知服务与相遇服务之差异性

美国亚利桑那大学教授古德克和商业作家威尔史在2000年合著的《勇敢的新服务策略》一书中,提出了相知服务与相遇服务的概念,在服务内容、顾客获取服务的方式、服务速度、服务便捷性、服务成本、服务人员与顾客情感交流方式、顾客反馈问题方式、服务效率度量难易程度、管理服务供求关系难易程度、顾客忠诚度、服务提供者报酬方式、员工满意度、经理职责、企业盈利水平方面存在差异,区分这些差异,有助于指导不同类别的服务企业制定有针对性的营销和管理对策。     

线性多用户检测器的软件无线电实现

无线多媒体通信的实现要求对不同种类业务提供不同的服务质量（ＱｏＳ）,文章将软件无线电技术应用于无线通信系统中,通过现场可编程门阵列（ＦＰＧＡ）和数字信号处理器（ＤＳＰ）的配合实现ＤＳ－ＣＤＭＡ系统的线性多用户检测。可以根据业务要求与信道状况调整线性滤波器抽头值,从而动态选择检测器类型,在算法复杂度和性能上求得平衡。仿真结果给出了４种线性多用户检测器对用户数及信噪比变化的性能比较。     

基于IP的3G服务质量控制及实现

第三代移动通信系统 (3G)的第二阶段是采用IP传送网 ,服务质量 (QoS)是极其重要的问题。在讨论基于IP的 3G中QoS体系结构、业务QoS要求基础上 ,重点研究QoS控制原理和区分服务的实现 ,并得出一些有参考价值的结论。     

Trade in High-Tech Services

This paper examines the size, scope, and potential implications of trade in high-tech services in the U.S. The results suggest that many service activities are tradable, tradable service activities tend to employ more educated workers and pay higher wages, and high-tech services account for a large share of service activities that are tradable. Service exporters are more prevalent in high-tech industries with larger establishments and higher wages. Within industries, service exporters tend to be larger, pay higher wages, and are more productive. Tradable service activities seem consistent with U.S. comparative advantage and, as a result, less likely to be vulnerable to offshoring. Consistent with this, recent employment growth in tradable service industries is not significantly different than employment growth in non-tradable service industries.     

How to Coordinate Value Generation in Service Networks

The fundamental paradigm shift from traditional value chains to agile service value networks implies new economic and organizational challenges. As coordination mechanisms, auctions have proven to perform quite well in situations where intangible and heterogeneous goods are traded. Nevertheless, traditional approaches in the area of multidimensional combinatorial auctions are not quite suitable to enable the trade of composite services. A flawless service execution and therefore the requester’s valuation highly depends on the accurate sequence of the functional parts of the composition, meaning that in contrary to service bundles, composite services only generate value through a valid order of their components. The authors present an abstract model as a formalization of service value networks. The model comprehends a graph-based mechanism implementation to allocate multidimensional service offers within the network, to impose penalties for non-performance and to determine prices for complex services. The mechanism and the bidding language support various types of QoS attributes and their (semantic) aggregation. It is analytically shown that this variant is incentive compatible with respect to all dimensions of the service offer (quality and price). Based on these results, the authors numerically analyze strategic behavior of participating service providers regarding possible collusion strategies.     

Lock in and switch: Asymmetric information and new product diffusion

Many new web-based services are introduced as free services. Depending on the seller??s business model, some remain free in the long run, while others switch to pay mode at some point in time. I characterize the relation between buyers and a new service seller when the former are uncertain about the latter??s business model and need to incur a one-time sunk cost before enjoying the new service. I derive a natural signaling equilibrium where the seller plays a ??lock-in-and-switch?? strategy, while buyers play a ??wait-and-see?? strategy. Specifically, a high-cost seller starts by pricing at zero and waits for a sufficient number of consumers to adopt the new service, at which point the seller switches to pay mode. In this gradual separation equilibrium, the signal is given not by the price level (which always starts at zero) but rather by the duration of the introductory offer. Finally, I show the equilibrium entails diffusion even though consumers are identical and equally aware of the new service??s existence.     

网上银行信息安全产品服务定价策略研究

作为营销新观念,服务营销以客户需求为中心,以提供优质服务为手段和方式,除了向顾客提供满意的产品以外,还注重向顾客提供与之相关的各种服务。本文试图从服务营销中的顾客感知价值的角度出发,运用服务定价的基本理论,将顾客感知价值与网上银行信息安全产品的服务定价联系起来,从顾客感知价值的角度探讨网上银行信息安全产品的顾客服务与服务定价策略,不仅关注网上银行信息安全产品的销售,更加关注顾客的需求、顾客购买和使用产品全过程的感受,旨在通过取得顾客满意度、忠诚度,实现网上银行业绩的持续改善和长期增长。     

Ensuring trust in one time exchanges: solving the QoS problem

We describe a pricing structure for the provision of IT services that ensures trust without requiring repeated interactions between service providers and users. It does so by offering a pricing structure that elicits truthful reporting of QoS by providers while making them profitable. This mechanism also induces truth-telling on the part of users reserving the service.