Although advances in wireless networks and the increasing availability of mobile end devices raise the prospect of ubiquitous access to network-based services, such access must cope with an inherent mismatch between the high bandwidth, relatively static connection requirements of many services and the low bandwidth, limited resource, and dynamic nature of mobile clients. In this paper, we descr...

There are activities aiming at abling users to dock to a wireless or wired network while visiting organisations outside the premises of their usual connection to the network. These activities, known as roaming access to network, are usually based on well-known technologies, such as RADIUS, IEEE 802.1X, VPN or HTTP redirection. On the other hand, there are applications, usually on the web, that ...

This attribute contains a short description of the item. It may also include a Gopher reference to a longer abstract, held in a separate Gopher node. ASK This attribute is used for the interactive query extension. The interactive query facility in Gopher+ is used to obtain information from a user before retrieving the contents of a node. The client fetches the ASK attribute, which contains a li...

Wireless Sensor Networks impose additional challenges on Media Access Control mechanisms. Many schemes have been proposed that use either CSMA or TDMA protocols; however design of a CSMA protocol for WSNs must be more than a general purpose mechanism. In this work, we analyze the parameters of a CSMA layer and their affect on performance. We examine how to use upcalls to notify applications of ...

We present NANO, a system that establishes whether performance degradations that services or clients experience are caused by an ISP’s discriminatory policies. To distinguish discrimination from other causes of degradation (e.g., overload, misconfiguration, failure), NANO uses a statistical method to estimate causal effect. NANO aggregates passive measurements from end-hosts, stratifies the mea...

Long-distance telephone companies in the United States (U.S.) pay access fees to local telephone companies to transport calls that originate and terminate on their networks. These charges form the largest portion of the cost of providing long-distance service. Recent changes in the structure of access rates, which were mandated by the Federal Communications Commission (FCC), have created opport...

The utility of computer networking is widely accepted, as is the complexity of accessing network resources and services. This complexity must be reduced to support more effective user access to and utilization of these resources as discussed in References 1 through 3. Accomplishing this reduction across heterogeneous systems is a primary objective of network access support. Specific capabilitie...