Cloud-assisted body area networks: state-of-the-art and future challenges

Body area networks (BANs) are emerging as enabling technology for many human-centered application domains such as health-care, sport, fitness, wellness, ergonomics, emergency, safety, security, and sociality. A BAN, which basically consists of wireless wearable sensor nodes usually coordinated by a static or mobile device, is mainly exploited to monitor single assisted livings. Data generated by a BAN can be processed in real-time by the BAN coordinator and/or transmitted to a server-side for online/offline processing and long-term storing. A network of BANs worn by a community of people produces large amount of contextual data that require a scalable and efficient approach for elaboration and storage. Cloud computing can provide a flexible storage and processing infrastructure to perform both online and offline analysis of body sensor data streams. In this paper, we motivate the introduction of Cloud-assisted BANs along with the main challenges that need to be addressed for their development and management. The current state-of-the-art is overviewed and framed according to the main requirements for effective Cloud-assisted BAN architectures. Finally, relevant open research issues in terms of efficiency, scalability, security, interoperability, prototyping, dynamic deployment and management, are discussed.     

A state-of-the-art survey on wireless rechargeable sensor networks: perspectives and challenges

Wireless Networks - Wireless rechargeable sensor network (WRSN) is an emerging technology that has risen intending to enhance network lifetime of the conventional wireless sensor networks (WSNs)....     

Control and management in next-generation networks: challenges andopportunities

This article discusses the challenges and opportunities associated with a fundamental transformation of current networks toward a multiservice ubiquitous infrastructure with a unified control and management architecture. After articulating the major driving forces for network evolution, we outline the fundamental reasons why neither the control infrastructure of the PSTN nor that of the present-day Internet is adequate to support the myriad of new services in next-generation networks. Although NGN will inherit heavily from both the Internet and the PSTN, its control and management architecture is likely to be radically different from both, and will be anchored on a clean separation between a QoS-enabled transport/network domain and an object-oriented service/application domain, with a distributed processing environment that glues things together and universally addresses issues of distribution, redundancy, and concurrency control for all applications. Finally, we allude to the transition issues and show how voice-over-packet services are emerging as the bootstrap application for marshaling in the NGN architecture     

Key research challenges in network management

Although network management has always played a key role for industry, it only recently received a similar level of attention from many research communities, accelerated by funding opportunities from new initiatives, including the FP7 Program in Europe and GENI/FIND in the United States. Work is ongoing to assess the state of the art and identify the challenges for future research in the field, and this article contributes to this discussion. It presents major findings from a two-day workshop organized jointly by the IRTF/NMRG and the EMANICS Network of Excellence, at which researchers, operators, vendors, and technology developers discussed the research directions to be pursued over the next five years. The workshop identified several topic areas, including management architectures, distributed real-time monitoring, data analysis and visualization, ontologies, economic aspects of management, uncertainty and probabilistic approaches, as well as understanding the behavior of managed systems.     

Transmission power control in wireless ad hoc networks: challenges, solutions and open issues

Recently, power control in mobile ad hoc networks has been the focus of extensive research. Its main objectives are to reduce the total energy consumed in packet delivery and/or increase network throughput by increasing the channel's spatial reuse. In this article, we give an overview of various power control approaches that have been proposed in the literature. We discuss the factors that influence the selection of the transmission power, including the important interplay between the routing (network) and the medium access control (MAC) layers. Protocols that account for such interplay are presented.     

GMPLS operations and management: today's challenges and solutions for tomorrow

This article examines the technical challenges involved in the delivery of GMPLS, and in particular the challenges in managing these networks. This article focuses first on requirements gathered from customers who are deploying GMPLS in their networks, or will be doing so in the near future. The motivations for these requirements are often based on a service provider's next-generation network designs that are motivated primarily by network convergence, and the promised operational and capital expense reductions and architectural simplifications over existing segregated network designs. This article then considers various solution options to manage GMPLS networks based on these requirements. The key areas examined include provisioning/configuration, performance monitoring and operations and management, and tools that can be used for these purposes. We conclude with a recap of standardization issues and opportunities.     

Resource management and dimensioning in ATM networks

A general overview of resource management aspects of ATM networks is presented, and mechanisms of load control have been considered. A general framework of resource management is first addressed. Two main aspects of traffic characterization are then examined from the traffic engineering point of view: teleservice characterization and user characterization. These form the basis of the analysis that follows. In particular, a bandwidth assignment proposal is presented and evaluated by simulation. Policing issues are discussed. The advantages of the proposed assigned method over the peak bit rate allocation method is proved for two typical dimensioning cases     

OFDM for cognitive radio: merits and challenges [accepted from open call]

Cognitive radio is a novel concept that enables wireless systems to sense the environment, adapt, and learn from previous experience to improve the quality of the communication. However, CR requires a flexible and adaptive physical layer in order to perform the required tasks efficiently. In this article, CR systems and their requirement of a physical layer are discussed, and the orthogonal frequency division multiplexing technique is investigated as a candidate transmission technology for CR. The challenges that arise from employing OFDM in CR systems are identified. The cognitive properties of some OFDM-based wireless standards also are discussed to indicate the trend toward a more cognitive radio.     

Energy efficient data collection in UAV-assisted Internet of things: trajectory planning and aerodynamic-based attitude control

Due to its inherent characteristics of flexible mobility, unmanned aerial vehicle(UAV) is exploited as a cost-efficient mobile platform to assist remote data collection in the 5 th generation or beyond the 5 th generation(5 G/B5 G) wireless systems. Compared with static terrestrial base stations, the line-of-sight(LoS) link between UAVs and ground nodes are stronger due to their flexibility in three-dimensional(3 D) space. Due to the fact that flexible mobility of UAVs requires high propulsion p...     

Signal processing challenges in active queue management

The publication of Floyd and Jacobson's seminal paper "Random early detection gateways for congestion avoidance" (1993), marked a new direction in networking research and began what is perhaps the most investigated example of cross-layer optimization. While this paper has inspired an immense amount of work in research, many open problems in active queue management (AQM) still remain. This article seeks to frame these problems in terms accessible to the signal processing researchers. The basic idea of AQM has been provided as well as its objective and overviews of a sample of different approaches. The signal processing aspects of the AQM are discussed, specifically the problem of predicting congestion, approaches to detecting changes in network traffic, an estimation problem, dithering, and quantization.     

Resource management in software-programmable router operatingsystems

Future routers will not only forward data packets but also provide value-added services, such as security, accounting, caching, and resource management. These services ran be implemented as general programs, to be invoked by traversing packets embedding router program calls. Software-programmable routers pose new challenges in the design of router operating systems (OS). First, router programs will require access to diverse system resources. The resource demands of a large community of heterogeneous resource consumers must either be coordinated to enable cooperation or arbitrated to resolve competition. Second, it is beneficial to concurrently support multiple virtual machines, each with a guaranteed share of physical resources. This allows services to be customized and to seamlessly evolve. We present the design and implementation of a next generation router OS that can meet the above challenges. We define an orthogonal kernel abstraction of resource allocation, which can schedule various time-shared and space-shared resources with quality of service (QoS) differentiation and guarantees. A scalable and flexible packet classifier enables dynamic resource binding and per-flow processing of received packets. We have prototyped our system on a network of UltraSPARC and Pentium II computers. Currently, QoS-aware schedulers for CPU time, forwarding bandwidth, memory-store capacity, and capacity for secondary data stores have been integrated. We present experimental results on various aspects of resource management in our system     

Key challenges in distributed management of broadband transportnetworks

Significant attention has been focused on establishing a framework of standards and generic guidelines for a layered, distributed approach to network management for broadband transport networks. Initial field deployment trials based on these efforts, using SNCs (subnetwork controllers) or EMs (element managers), have just begun. The paper outlines early distributed management applications that are being considered for deployment in the 1995 time frame. The focus is on the key challenges that must be addressed in realizing initial field deployment of distributed broadband management applications     

IP multicast operational network management: design, challenges, and experiences

Multicast is a natural enabler for carrying high-bandwidth multimedia broadcasts and seminars on IP networks. Despite the increased need for IP multicast, its commercial deployment has not been widespread. The lack of appropriate network management tools for IP multicast has proven to be a major barrier to its deployment. In this paper we survey the currently available multicast management tools and discuss why they are insufficient. We describe the requirements of an operational multicast management platform and present mmon, a multicast network management system we have built, aimed primarily for use by engineering and operations personnel. Mmon has been tried by over 200 sites and is currently used at HP to manage the multicast network. We discuss some of the challenges and our experiences with designing, implementing, and deploying the system.     

CDIO模式下开放实验室的建设与管理

采用先进的工程教育模式—CDIO模式来培养创新型、实用型和实践型一体化人才,是一种现代创新型思维。利用环境优良、设备先进的开放实验室,让学生们自行设计实验方案,然后针对性地进行适当的指导,可以充分激发学生的学习兴趣,达到因施教的目的,在加强学生主动性和创造性的同时,还能提高其创新能力。开放实验室的建设与管理如何积极发挥CDIO模式的长处,推进CDIO教育模式高效率运行,将教学资源合理利用和整合,达到实践创新学生能力的目标和意义,还需继续研究与完善。文章主要分析探讨了CDIO模式下开放实验室的建设与管理。     

Call management in the open distributed office

This paper describes an agent-based model for the effective management of voice calls within an integrated computing-telephony environment. In this model, agents manage calls on behalf of users, who influence the behaviour of their agents by means of policy specifications. Call set-up then involves a negotiation process whereby agents attempt to agree upon some course of action and the agents involved can continue to exercise control over a call in progress     

MEC技术在视频监控领域的应用

随着移动通信技术和人工智能技术的共同发展,视频监控领域出现了越来越多的移动化巡查设备,由此产生的海量的监控数据,必然给移动网络带来巨大的传输压力,在移动网络边缘部署MEC服务器,将可能是解决这个问题的一种方案。介绍了视频监控智能化、移动化的进程,分析了视频监控"云边协同"的发展现状,重点研究了MEC技术以及MEC技术如何与视频监控业务相结合。     

VPN用户管理中的资源代理

互联网的快速发展使得如何实现信息的安全传送和资源的充分利用成为亟需解决的两大问题，虚拟专用网（VPN）则为这两大问题提供了很好的解决方案。在传统的VPN环境中，是由VPN提供商管理VPN资源，而用户分配给他们的资源无法控制，但随着VPN应用越来越广泛，用户希望能根据自己的需求以及管理重点来个性化定制VPN网管系统。提出一种基于Web的虚拟网络资源管理体系结构的方案，并深入探讨了这一方案中资源代理的实现模型。     

Resource management in an integrated optical network

We propose a novel integrated optical network switching architecture. The proposal offers an approach to signaling for the purpose of transport on an all-optical network of optical and nonoptical legacy network traffic. In order to provide effective end-to-end control and efficient transport services, new signaling and control techniques are required. Standard organizations such as Optical Interworking Forum (OIF) and Internet Engineering Task Force have developed interface methods between client and transport networks, as well as signaling processes for resource allocation. We propose a network controller, which implements interfaces for such integration in the intermediate future, as well as provides a feasible path for the long-term objective of all optical networking. Performance and capacity issues for these systems introduce new dimensions to the existing set of networking problems, since optical paths can now be set up in real-time. There are two main contributions in this paper: (1) functional composition of a network controller, which translates legacy signaling to optical connection signaling and path establishment and (2) determining when to issue an optical connection request based on the current network conditions such as link utilization, so that the integrated optical network can operate efficiently. Analytical approximations, as well as simulation results for call blocking performance are also presented.     

Interference and Resource management strategy for handover in femtocells

Interference in femtocells due to neighboring femtocells and macrocells is a major issue of two-tier networks. Handover should be made to reduce interference, if and only if, when resources are available. Otherwise, it will further degrade network performance. Resource management should be made in an efficient manner that will not cause interference between macrocells and neighboring femtocells. Since distance between macro base station (MBS) and femto access point (FAP) is short, therefore, it is very hard to sustain low handover probability when macro user moves from MBS to FAP. We proposed handover algorithm for uplink co-channel interference mitigation that will make handover decision on the basis of time-to-stay and signal to interference plus noise ratio thresholds along with efficient resource management mechanism to reduce number of handovers and also resolve interference problem.