Power Allocation for Two-Way Relay System Based on Sequential Second Price Auction

In this paper, we consider a multiuser multi-antenna two-way relay system in which multiple pairs of partners communicate via a single relay node. The total transmit power of the relay node is shared by all pairs of partners. In order to allocate the limited power with both efficiency and fairness, we introduce a sequential second price auction as a mechanism to achieve such goals. First, we provide the system model and formulate the channel capacity of each pair. Then, we construct an algorithm which leads to the equilibrium of a sequential second price auction with full information assumption and sophisticated bidding strategy. The equilibrium result is used for allocating the relay power among pairs of partners. Finally, we provide the simulation results considering both randomness of user locations and time-varying nature of wireless channels, which show that the proposed algorithm has a good performance in total channel capacity, system efficiency, and fairness.     

下一代电信网的特点、结构和演进

本文首先分析了新时期的挑战,得出发展下一代电信网是历史必然的结论,然后分别探讨了电路交换网和数据网演进思路,最后给出了一代电信网的特点,结构和演进的思考。     

Service differentiation economic models and analysis of market-based QoS interconnections

Technical and regulatory changes motivate the economics of the interconnections to be re-examined for the next-generation Internet. This paper presents a framework for the economics of market-based QoS interconnection networks. The economic model presented captures the characteristics of opportunity costs and demands and suggests strategies for QoS pricing and allocation. We use the statistical results of network simulation to present numerical examples of those market opportunity costs with respect to the contracted QoS network services. Using the model, we show the network economics of market-based QoS interconnections.     

Designing Auction Mechanisms for Dynamic Spectrum Access

With the increasing demands for radio spectrum, techniques are being explored that would allow dynamic access of spectrum bands that are under-utilized. In this regard, a new paradigm called dynamic spectrum access is being investigated where wireless service providers (WSPs) would dynamically seek more spectrum from the under-utilized licensed bands when and where they need without interfering with the primary users. Currently, there is little understanding on how such a dynamic allocation will operate so as to make the system feasible under economic terms. In this paper, we consider the dynamic spectrum allocation process where multiple WSPs (bidders) compete to acquire necessary spectrum band from a common pool of spectrum. We use auction theory to analyze the allocation process when the demand from WSPs exceeds the available spectrum. We investigate various auction mechanisms under different spectrum allocation constraints to find WSPs’ bidding strategies and revenue generated by spectrum owner. We show that sequential bidding of bands provides better result than the concurrent bidding when WSPs are constrained to at most single unit allocation. On the other hand, when the bidders request for multiple units, (i.e., they are not restricted by allocation constraints) synchronous auction mechanism proves to be beneficial than asynchronous auctions.

基于无线传感器网络的跨层拥塞控制协议

无线传感器网络(WSN)中由拥塞引起的大量分组重传以及重传多次失败后的分组丢弃会导致较长的时延、较高的分组丢失率和较多的能量消耗.为了准确探测和控制网络拥塞,提出了一种基于跨层设计的拥塞控制协议,即上行拥塞控制(UCC)协议.该协议利用节点在媒质接人控制(MAC)层中未占用的缓冲器区间大小和所预测的通信流量作为该节点的...     

电信网发展的战略趋势

本文概要论述了笔者对未来电信网发展的战略趋势的看法,主要涉及网络业务的数据化趋势,网络的宽带化趋势,网络的光纤化趋势,网络接入的无线化趋势,网络的分组化趋势以及三网融合的大趋势。     

基于定价优化的QoS框架设计

提出了一个基于智能代理的简单且灵活的优化框架,把资源竞争过程中的竞争者抽象为用户、网络节点和ISP,分别分析了价格对其QoS的影响,建立优化模型,使得实际网络中资源竞争者能够对价格的变动作出合理的反应,从而提高了整个网络的QoS。     

Study on the Winning Probability for a Bid in Procurement Combinational Auction with Tree Structure

In this paper, the processes to determine winning probability for the corresponding bidder's deterministic bid are presented. The analysis of the winning probability is crucial for studying the bidding equilibria and designing the mechanism of procurement combinational auctions (CAs), and it also provides the decision making support for bidders who are in commercial synergies surrounding. Finally, an example is used to illustrate the feasibility and detailed processes of calculating winning probability.     

面向大数据定价的委托拍卖方案

大数据合理定价是当前大数据交易中亟待解决的具有一定挑战性问题之一.本文针对大数据定价困难问题,基于Micali-Rabin的安全计算技术提出一种具有大数据定价功能的安全委托拍卖方案.在方案中首先基于Micali-Rabin的随机向量表示方法设计满足标价密封性的大数据拍卖及验证算法.其次,基于Merkle树和Bit承诺协议实现大数据交易中数据的完整性和底价的不可否认性,特别是在定价阶段,利用一种特殊的多方安全计算协议隐藏大数据的底价,以此保障了大数据交易的公平性.最后,方案安全性和性能分析表明,该方案特别适用于大数据交易场景下的数据委托拍卖.     

智能蚂蚁算法及其在电信网动态路由优化中的应用

本文介绍一种新的、启发式的、具有自组织能力的智能蚂蚁算法；并针对我国电信网的具体情况，提出借助这种智能蚂蚁算法，用分散控制的方式实现电信网动态路由优化的一种方案，目的是提高网络资源的利用率，网络运行的效率和可靠性。     

下一代电信网业务节点的发展趋势

本文首先阐明发展下一代电信网是历史的必然 ,然后分析了现有电信网向下一代电信网的演进策略 ,接下来重点探讨了下一代电信网业务节点的要求以及五类不同业务节点的结构、功能、特点及其发展趋势     

电信网的技术转型和下一代网的发展和演进

本文首先探讨了电信业宏观发展环境的历史性变化,阐明电信网面临的技术转型的重任和向下一代网发展的必然性,然后分析了下一代网络的基本概念和特点,接下来分别探讨了向以软交换/IMS为核心的下一代交换网的演进,向以3G/B3G为代表的下一代移动通信网的演进,向以IPv6为基础的下一代互联网的演进,向多元化的无缝宽带接入网的演进以及向以光联网为基础的下一代传送网的演进.最后指出各种层次意义上的融合将是下一代网络和业务发展的主旋律和长期奋斗方向,对转型的难度和所面临的主要挑战要有足够的认识.     

A distributed pricing algorithm for achieving network‐wide proportional fairness

Proportional fairness (PF) scheduling achieves a balanced tradeoff between throughput and fairness and has attracted great attention recently. However, most previous work on PF only considers the single cell scenario. This paper focuses on the problem of achieving network‐wide PF in a generalized multiple base station multiple user network. The problem is formulated as a maximization model and solved using the dual method. By decomposing the dual objective function, we get a distributed pricing based algorithm. Optimality of this algorithm is presented. Although the algorithm is derived using fixed link rate assumption, it can still apply in the presence of time‐varying rates. The proposed algorithm is suitable for distributed systems in the sense that it does not need any inter base station communication at all. Simulations illustrate that the proposed distributed network‐wide PF scheduling algorithm achieves almost the same performance as the centralized one. Compared with traditional local PF (LPF) scheduling, the network‐wide PF scheduling achieves higher throughput, lower throughput oscillation, and greater fairness. Copyright © 2010 John Wiley & Sons, Ltd.     

无线Ad Hoc网络中动态的带宽管理

基于已有的带宽管理机制,采用加权公平对竞争的流分配带宽,不仅可以对流实现准入控制,以保证每条流的最低信道时间需求,同时也能动态地调节流所分配的信道时间。另外,我们的方案,也适用于多跳的情况,通过例子说明,在考虑到用户需求的同时,也提高了网络的吞吐量。     

1588v2在电信网应用的标准化进程

文章介绍了1588v2在电信网领域应用的背景、需求和主要标准组织ITU-T的相关工作进展,包括频率同步应用和时间同步应用。通过分析目前1588v2电信应用规范中的热点问题,如影响1588v2频率恢复性能的网络分组延时变化(PDV)指标、1588v2端到端频率传送的应用场景和协议规范,提出1588v2在电信网络部署的可靠性、可管理维护等特点和基本思路,并对未来标准化需要解决的问题进行总结。     

网络故障管理专家系统及知识发现系统

文章研究网络故障管理专家系统及知识发现系统，设计和实现了一个在线，实时的网络故障诊断专家系统，AngelES和一个基于数据融合的网络告警序列知识发现系统TNAKDS，AngelES知识库中的知识由TNAKDS进行更新。     

一种适用于LAN及中高速Internet接入的PON系统

一种适用于高速计算机通信的共享接入的新型PON系统,将使多个ONU公平共享一条高速宽带通道,从而提供经济有效的中高速Internet接入。     

3G网络计费系统体系结构

本文分析了3G网络计费系统的设计要求,研究了目前一般的计费系统架构,提出一种基于业务特征的3G计费系统的体系结构,该体系结构能够帮助计费系统处理面向客户和合作伙伴的个性化、多样化,能够处理对业务计费的实时性,能够具有业务演变的动态适应性.     

Channel-Aware Earliest Deadline Due Fair Scheduling for Wireless Multimedia Networks

Providing delay guarantees to time-sensitive traffic in wireless multimedia networks is a challenging issue. This is due to the time-varying link capacities and the variety of real-time applications expected to be handled by such networks. We propose and evaluate the performance of a channel-aware scheduling discipline and a set of policies that are capable of providing such delay guarantees in TDM-based wireless networks. First, we introduce the Channel-Dependent Earliest-Due-Date (CD-EDD) discipline. In this discipline, the expiration time of the head of line packets of users' queues is taken into consideration in conjunction with the current channel states of users in the scheduling decision. This scheme attempts to guarantee the targeted delay bounds in addition to exploiting multiuser diversity to make best utilization of the variable capacity of the channel. We also propose the violation-fair policy that can be integrated with the CD-EDD discipline and two other well-known scheduling disciplines [1, 2]. In this policy, we attempt to ensure that the number of packets dropped due to deadline violation is fairly distributed among the users. The proposed schemes can provide statistical guarantees on delays, achieve high throughput, and exhibit good fairness performance with respect to throughput and deadline violations. We provide extensive simulation results to study the performance the proposed schemes and compare them with two of the best known scheduling disciplines [1, 2] in the literature. Khaled M. F. Elsayed (S90-M95-SM02) received his B.Sc. (honors) in electrical engineering and M.Sc. in engineering mathematics from Cairo University in 1987 and 1990 respectively. He received his Ph.D. in computer science and computer engineering from North Carolina State University in 1995. He is now an Associate Professor in Cairo University, Egypt and is an independent telecommunications consultant. Between 1995 and 1997, he was a member of scientific staff with Nortel Wireless Systems Engineering in Richardson, TX.Dr. Elsayed was the editor for the Internet technology series of the IEEE Communications Magazine from 1998 until 2002. He has served on technical program committees for several IEEE, IFIP, and ITC conferences. He was the technical co-chair for IFIP MWCN 2003 conference in Singapore. He also served as an expert evaluator for the European Commission FP5 and FP6 programmes. His research interest is in the area of performance evaluation of communication networks including IP, wireless and optical networks. Ahmed Khattab received his B.Sc. (honors) and MS.C in Electronics and Communications Engineering from Cairo University in 2002 and 2004 respectively. Since August 2005, he is pursuing his PhD degree at Rice University, Texas. His research interests are in wireless networking and radio resource management.     

无线充电及其在图像采集粮虫检测传感器网络中的应用

随着科技的发展,无线充电技术在各个领域的应用也越来越广泛,比如在手机、电脑、相机、汽车等行业的部分最新产品中已经使用了无线充电技术。介绍了一种简便高效的无线充电方案,应用于埋入式图像采集粮虫检测系统,以确保传感器网络节点能够方便、安全、稳定地工作。该系统的工作环境特殊,无线充电技术有无需物理接触的优势,可以合理有效地替代传统的有线充电方法。使用高度集成的XKT-408A作为系统的发射芯片,再配合极少的外部元件就可以制作可靠稳定的无线充电器,不仅保证了无线充电的传输效率,也大大降低传感器网络节点的体积。