Paul Goransson's Secure Roaming In 802.11 Networks PDF

By Paul Goransson

ISBN-10: 0750682116

ISBN-13: 9780750682114

This booklet explores the elemental ideas, easy concept, and key rules of 802.11 networks with roaming services. this present day, we more and more look forward to finding public large neighborhood quarter community (WLAN) 802.11 entry in our airports, public areas, and resorts, and we wish to hold our connections whilst we are cellular and utilizing 802.11 WLANs. despite the fact that, 802.11 was once now not initially designed with roaming features and cannot, in its "pure" shape, help seamless roaming among assorted hotspots and different 802.11 entry issues. This e-book info the speculation in the back of a variety of 802.11 extensions to allow roaming and describes how those extensions might be effectively carried out in 802.11 WLANs. assurance of consumer Authentication in 802.11 is reviewed as is roaming among 802.11 and different instant applied sciences. instant applied sciences and alertness programming interfaces are given their due with beneficiant assurance besides. * deals a entire treatise on wireless 802.11 roaming by way of comparing/contrasting it to mobile roaming idea and methods * Emerges as a "one cease" source for layout engineers charged with satisfying the industry want for seamless 802.11 gadget roaming functions * Builds upon the data base of a pro viewers with no delving into lengthy discussions of idea lengthy in view that mastered

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Additional resources for Secure Roaming In 802.11 Networks

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As the subscriber moved around the service area, the signals from any receivers that picked up the transmission were combined, amplified, and then retransmitted through the PSTN [10]. Systems with similar capabilities, but with different technology, began appearing in Europe. A-Netz, a manually switched network offering sixteen 50-KHz channels in the 160-MHz range, was introduced in 1958 in cities all over Germany [22]. In this system, mobile stations could place calls but not receive them. With B-Netz, a later version of the same system introduced in 1972, calls could be placed to a mobile from the fixed network, but only if the location of the mobile unit was already known [22].

This is because everyone would have to transmit on the same spectrum, which would significantly limit useable bandwidth. Even decades old shortwave radio satisfies these requirements to a large extent. Alas, for the voice- and data cellular networks that we introduce in the early chapters of this book, these “inconveniences” are clearly unacceptable, and the individual stations need to have independent, bidirectional communications with the antenna. Thus, some type of multiplexing is required. 3 Number of Active Users in a Cell The multiplexing mentioned in the previous section must allow multiple users in the cell to maintain independent, bidirectional communications.

When transitioning between two antennae requires intervention by more than just the radio-layer, this transition may be an instance of roaming in the cellular telephony world, but it is not properly called a handoff in that world. In this book we use the term “handoff” to mean both things. Similarly, handoffs between two antennae of the same provider do not constitute a “roam” in the specialized vocabulary of cellular telephony, whereas this transition is a “roam” within our context of this book.

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Secure Roaming In 802.11 Networks by Paul Goransson

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