000			02292nam a22002537a 4500
003			OSt
005			20220809132049.0
008			121220b xxu||||| |||| 00| 0 eng d
020			_a9781402066306
040			_ckinley
082			_a621.384 FAT
100	1		_aFathi, Hanane.
245	1	0	_aVoice over IP in wireless heterogeneous networks : _bsignaling, mobility and security / _cHanane Fathi, S. S Chakraborty and Ramjee Prasad.
260			_aNew York : _bSpringer, _c2008.
300			_axxix, 226 p. : _bill. ; _c24 cm.
504			_aIncludes bibliographical references and index.
520			_a The 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.
650			_aInternet telephony.
650			_aWireless communication systems.
650			_aTECHNOLOGY & ENGINEERING _x Telecommunications.
700			_aChakraborty S.S.
700			_aPrasad R.
942			_2ddc _cBK
999			_c4207 _d4207