03470nam a22004215i 4500001001800000003000900018005001700027007001500044008004100059020001800100020001900118024003500137082001600172100002800188245017100216264004600387300002100433336002600454337002600480338003600506347002400542490005300566505044900619520147501068650001702543650003602560650002302596650001702619650004202636650006202678700003502740700002902775710003402804773002002838776003602858830005302894856010102947978-1-4020-6631-3DE-He21320260521092141.0cr nn 008mamaa100301s2009    ne |    s    |||| 0|eng d  a9781402066313  a997814020663137 a10.1007/978-1-4020-6631-32doi04a621.3822231 aFathi, Hanane.eauthor.10aVoice over IP in Wireless Heterogeneous Networksh[electronic resource] :bSignalling, Mobility, and Security /cby Hanane Fathi, Shyam S. Chakraborty, Ramjee Prasad. 1aDordrecht :bSpringer Netherlands,c2009.  bonline resource.  atextbtxt2rdacontent  acomputerbc2rdamedia  aonline resourcebcr2rdacarrier  atext filebPDF2rda1 aSignals and Communication Technology,x1860-48620 aIP-Based Wireless Heterogeneous Networks -- Voice over Internet Protocol -- Models for Performance Analysis in Wireless Networks -- Impact of Security on Real-Time Services: Link Layer Authentication Delay in WLAN 802.11b -- Impact of Signalling on Real-Time Services: SIP Session Setup Delay -- Impact of Mobility on Real-Time Services: Handover Delay -- Coupling Mobility and Security -- Towards Quality of Experience and Future Perspectives.  aThe convergence of different types of traffic has preceded the convergence of systems and services in a wireless heterogeneous network. Voice and data traffic are usually treated separately in both 2G and 2.5G wireless networks. With advances in packet switching technology and especially with the deployment of wireless heterogeneous systems, both speech and data traffic are carried over wireless links by the same IP-based packet-switched infrastructure. However, this combination faces some challenges due to the inherent properties of the wireless network. The requirements for good quality VoIP communications are difficult to achieve in a time-varying environment due to channel errors and traffic congestion and across different systems. The provision of VoIP in wireless heterogeneous networks requires a set of time-efficient control mechanisms to support a VoIP session with acceptable quality. The focus of Voice over IP in Wireless Heterogeneous Networks is on mechanisms that affect the VoIP user satisfaction while not explicitly involved in the media session. This relates to the extra delays introduced by the security and the signaling protocols used to set up an authorized VoIP session and to the disruption caused by the user mobility during the session. Voice over IP in Wireless Heterogeneous Networks thus investigates and proposes cross-layer techniques for realizing time-efficient control mechanisms for VoIP: signaling, mobility and security. 0aENGINEERING. 0aCOMPUTER NETWORK ARCHITECTURES. 0aTELECOMMUNICATION.14aENGINEERING.24aCOMMUNICATIONS ENGINEERING, NETWORKS.24aCOMPUTER SYSTEMS ORGANIZATION AND COMMUNICATION NETWORKS.1 aChakraborty, Shyam S.eauthor.1 aPrasad, Ramjee.eauthor.2 aSpringerLink (Online service)0 tSpringer eBooks08iPrinted edition:z9781402066306 0aSignals and Communication Technology,x1860-486240uhttp://dx.doi.org/10.1007/978-1-4020-6631-3zVer el texto completo en las instalaciones del CICY