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CONNECTivity

连通性是‘点集拓扑学’中的基本概念,把‘连通性’定义如下:对于拓扑空间X,(1)若X中除了空集和X本身外,没有别的既开又闭的子集,则称此‘拓扑空间X是连通的’。(2)若E作为X的子空间,E在诱导拓扑下是可连通的,则称拓扑空间X的子集E,是连通的。
  • Artificial+Intelligence

    The current methods of communications are becoming less relevant under today’s growing demand for and reliance on constant CONNECTivity. Of decreasing relevance are the models of a single radio to perform a single task. The expansion of wireless access points among coffee shops, airports, malls, and other public arenas is opening up opportunities for new services and applications.

    标签: Intelligence Artificial

    上传时间: 2020-05-26

    上传用户:shancjb

  • Microwave+Transmission+Networks

    Microwave radio network design is a subset of activities that constitute the overall transmission network design. Transmission networks are sometimes called transport networks, access networks, or CONNECTivity networks. For many wireless carriers, microwave is becoming a popu- lar preference over wireline (leased lines) transport for many reasons, especially as microwave radio equipment costs decrease and installation becomes simpler. Low monthly operating costs can undercut those of typical single (and especially multiple) T1/E1 expenses, proving it to be more economical over the long term—usually two to four years. Network operators also like the fact that they can own and control microwave radio networks instead of relying on other service providers for network components.

    标签: Transmission Microwave Networks

    上传时间: 2020-05-28

    上传用户:shancjb

  • Multihop+Wireless+Networks

    Advances in communication and networking technologies are rapidly making ubiq- uitous network CONNECTivity a reality. Wireless networks are indispensable for supporting such access anywhere and at any time. Among various types of wire- less networks, multihop wireless networks (MWNs) have been attracting increasing attention for decades due to its broad civilian and military applications. Basically, a MWN is a network of nodes connected by wireless communication links. Due to the limited transmission range of the radio, many pairs of nodes in MWNs may not be able to communicate directly, hence they need other intermediate nodes to forward packets for them. Routing in such networks is an important issue and it poses great challenges.

    标签: Multihop Wireless Networks

    上传时间: 2020-05-31

    上传用户:shancjb

  • Power+Control+in+Wireless+Cellular+Networks

    Transmit power in wireless cellular networks is a key degree of freedom in the management of interference, energy, and CONNECTivity. Power control in both uplink and downlink of a cellular network has been extensively studied, especially over the last 15 years, and some of the results have enabled the continuous evolution and significant impact of the digital cellular technology.

    标签: Cellular Networks Wireless Control Power in

    上传时间: 2020-05-31

    上传用户:shancjb

  • Radio+Protocols+for+LTE+and+LTE-A

    It was only a few years ago that “ubiquitous CONNECTivity” was recognized as the future of wireless communication systems. In the era of ubiquitous CONNECTivity, it was expected that the broadband mobile Internet experience would be pervasive, and seamless CONNECTivity on a global scale would be no surprise at all. The quality of service would be guaranteed no matter when/where/what the users wanted with the CONNECTivity. CONNECTivity would even be extended to object-to-object communication, where no human intervention was required. All objects would become capable of autonomous communication.

    标签: Protocols Radio LTE-A LTE for and

    上传时间: 2020-06-01

    上传用户:shancjb

  • Voice+Over+WLANS

    Two of the major developments reshaping the telecommunications landscape are mobile wireless CONNECTivity and the migration of voice telephone services to IP technology. Those two ideas come together in networks that carry voice services over a wireless LAN (VoWLAN). The purpose of this text is to provide network professionals with the technical background and practical guidance needed to deploy these networks successfully.

    标签: Voice WLANS Over

    上传时间: 2020-06-01

    上传用户:shancjb

  • Wireless Communications & Networking

    During the past three decades, the world has seen signifi cant changes in the telecom- munications industry. There has been rapid growth in wireless communications, as seen by large expansion in mobile systems. Wireless communications have moved from fi rst-generation (1G) systems primarily focused on voice communications to third-generation (3G) systems dealing with Internet CONNECTivity and multi-media applications. The fourth-generation (4G) systems will be designed to connect wire- less personal area networks (WPANs), wireless local area networks (WLANs) and wireless wide-area networks (WWANs).

    标签: Communications Networking Wireless

    上传时间: 2020-06-01

    上传用户:shancjb

  • Wireless Receiver Architectures and Design

    The advent of modern wireless devices, such as smart phones and MID 1 terminals, has revolutionized the way people think of personal CONNECTivity. Such devices encompass multiple applications ranging from voice and video to high-speed data transfer via wireless networks. The voracious appetite of twenty-first century users for supporting more wireless applications on a single device is ever increasing. These devices employ multiple radios and modems that cover multiple frequency bands and multiple standards with a manifold of wireless applications often running simultaneously. 

    标签: Architectures Wireless Receiver Design and

    上传时间: 2020-06-01

    上传用户:shancjb

  • Wireless+Networking+Complete

    This chapter provides extensive coverage of existing mobile wireless technologies. Much of the emphasis is on the highly anticipated 3G cellular networks and widely deployed wireless local area networks (LANs), as the next-generation smart phones are likely to offer at least these two types of CONNECTivity. Other wireless technologies that either have already been commercialized or are undergoing active research and standardization are introduced as well. Because standardization plays a crucial role in developing a new technology and a market, throughout the discussion standards organizations and industry forums or consortiums of some technologies are introduced. In addition, the last section of this chapter presents a list of standards in the wireless arena.

    标签: Networking Wireless Complete

    上传时间: 2020-06-01

    上传用户:shancjb

  • Wireless-Based+Software+Systems

    The wide deployment of wireless networks and mobile technologies, along with the significant increase in the number of mobile device users, have created a very strong demand on various wireless-based, mobile-based software application systems and enabling technologies. This not only provides many new business opportunities and challenges to wireless and networking service providers, mobile technology ven- dors, and software industry and solution integrators, butalso changes and enhances people’s lives in many areas, including communications, information sharing and exchange, commerce, home environment, education, and entertainment. Business organizations and government agencies face new pressure fortechnology updatesto upgrade their networking infrastructures with wireless CONNECTivity to enhance enterprise-oriented systems and solutions.

    标签: Wireless-Based Software Systems

    上传时间: 2020-06-01

    上传用户:shancjb