By Hanane Fathi
The necessities for quality VoIP communications are tricky to accomplish in a time-varying surroundings as a result of channel blunders and traffic jam and throughout diversified structures. the availability of VoIP in instant heterogeneous networks calls for a suite of time-efficient regulate mechanisms to help a VoIP consultation with appropriate caliber. the focal point of Voice over IP in instant Heterogeneous Networks is on mechanisms that impact the VoIP consumer pride whereas no longer explicitly thinking about the media consultation. This pertains to the additional delays brought by way of the protection and the signaling protocols used to establish a certified VoIP consultation and to the disruption because of the consumer mobility in the course of the consultation. Voice over IP in instant Heterogeneous Networks therefore investigates and proposes cross-layer recommendations for knowing time-efficient regulate mechanisms for VoIP: signaling, mobility and safeguard.
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Additional resources for Voice over IP in Wireless Heterogeneous Networks: Signaling, Mobility and Security (Signals and Communication Technology)
29 Chapter 2. IP-Based Wireless Heterogeneous Networks • User traffic and sensitive signalling traffic confidentiality are provided by an encryption algorithm negotiated and an encryption key established during the mutual authentication between the serving network and the USIM. • UE identification is achieved by the serving network requesting the mobile station to send its international mobile equipment identity (IMEI), safely stored on the UE. This is used to deny access to stolen UEs. • User identity confidentiality is performed by USIM sending to the serving network a temporary international mobile subscriber identity (IMSI).
There is a lack of quantitative results demonstrating the impact of security on VoIP quality of experience in combination with 6 Chapter 1. Introduction a wireless environment. The link layer authentication delay is of direct impact on the VoIP user satisfaction as the user has to wait for the authentication to proceed in order to get granted the access to the network and to establish the VoIP session. Furthermore, the authentication delay may also disrupt or augment the disruption on an ongoing session if a handover happens.
Introduction 10. A. Zahedi, K. Pahlavan, “Capacity of a wireless LAN with voice and data services”, IEEE Transactions on Communications, vol. 48, no. 7, pp. 1160– 1170, 2000. 11. K. Medepalli, P. Gopalakrishnan, D. Famolari, T. 11g wireless LANs”, IEEE Global Telecommunications Conference, 2004. GLOBECOM’04, vol. 3, pp. 1549– 1553, 2004. 12. K. Medepalli, P. Gopalakrishnan, D. Famolari, T. 11a wireless LANs in the presence of channel errors and different user data rates”, IEEE Vehicular Technology Conference 2004, vol.