Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
IP telephony: Mobility and security
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
2005 (English)Doctoral thesis, monograph (Other scientific)
Abstract [en]

With the introduction of IP based telephony services, the Internet has started to challenge the traditional PSTN networks as an infrastructure for providing real-time interactive services. This upcoming paradigm shift is not only driven by the desire to provide cost efficient solutions, but by basing the communication on IP we expect that the end-users will experience a greater set of attractive services over a single connection compared to what is provided by a PSTN today. Looking a little further ahead, mobile communication systems will also become IP based. Companies, universities and private persons have started to extend their local area networks to provide wireless access by attaching wireless access points (APs) to their LAN. Wireless ISPs (WISPs) are putting up wireless LAN (WLAN) APs at public hot spots, thereby providing a complement or even a competitive alternative to the wireless WANs (WWANs) being developed and deployed today. As more and more people start to communicate using WLAN access, they will naturally wish to use this infrastructure for interactive real-time applications, such as mobile telephony.

This thesis concerns mobility and security support for IP telephony in public WLAN environments. The security issues addressed relate both to user requirements such as end-to-end confidentiality, and operator requirements such as network access control. Alternatives for how the voice media stream can be protected and the procedure to establish a secure call using SIP are described. Public WLAN architectures enabling service providers to share access network infrastructure are described and evaluated. To enforce access control the use of either IEEE 802.11i or L2TP/IPSec is suggested, since both meet the proposed security requirements, and both are standardized solutions available on modern systems.

The case where mobile users perform handovers between APs on the same LAN (layer-2 handover) and across IP subnets (layer-3) is studied. For layer-2 handovers the properties of IEEE 802.11b handover mechanisms and its impact on voice traffic, and the effect of the network access control mechanism on the handover performance are examined. The mechanisms necessary to perform layer-3 handovers and their impact on handover performance are described. The analysis focus on “SIP mobility” and Mobile IPv6, since these mobility management schemes provide optimal routing, thus are well suited for IP telephony

Place, publisher, year, edition, pages
2005. , 166 p.
Series
Trita-IMIT-TSLAB. AVH, 05:01
Keyword [en]
Telekommunikation
Keyword [sv]
Telekommunikation
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-260OAI: oai:DiVA.org:kth-260DiVA: diva2:8244
Public defence
2005-06-09, Sal E, KTH Forum, 10:00
Opponent
Supervisors
Available from: 2005-06-07 Created: 2005-06-07 Last updated: 2012-03-22

Open Access in DiVA

fulltext(831 kB)1561 downloads
File information
File name FULLTEXT01.pdfFile size 831 kBChecksum MD5
56adb879aef368a558a54fba70487a46e5d1f97f218b1cc28e48cc6e1409d262bb47b4bd
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Vatn, Jon-Olov
By organisation
Microelectronics and Information Technology, IMIT
Telecommunications

Search outside of DiVA

GoogleGoogle Scholar
Total: 1561 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 1513 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf