Wi-Fi devices used for voice over IP (VoIP) or other real-time applications that are WiFi Certified for WMM Power Save will have a substantially longer battery life, according to analyst Monica Paolini, president of Senza Fili Consulting. Estimating a 15to 40-percent improvement, Paolini says this is an important consideration for cell phone users who, unlike laptop users, don't usually have a ...

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IP telephony presents some big advantages over traditional circuit-switched telephony especially in the sense of increased utilization of expensive backbones and significantly reduced cost. However, in order to win the competition, IP telephony must provide the same quality of voice service as the traditional telephony, which has been proven as a major challenge. In today’s VoIP market, multipl...

Voice over IP (VoIP) is an emerging communication service allowing voice transmission over a private or a public IP network. VoIP allows significant benefits for customers and service providers including cost savings, phone and service portability, mobility, and the integration with other applications. Nevertheless, the deployment of the VoIP technology encounters many challenges such as intero...

IP telephony gaining momentum and cellular telephony having several hundred million users, it seems inevitable that some future wireless telephony systems will be based on IP technology. What we know today as cellular phones may, in addition to telephony and video, have IP stacks, Web browsers, e-mail clients, net-worked games, and so on. If based on IP, telephony service will be much more flex...

Mobile phone users are demanding an efficient convergent communication approach for efficient communication and information sharing with their real life social circles. Unfortunately, the existing telecom services and the popular Internet services are not organically integrated to provide convenient convergent services. To overcome this issue, one of the promising convergent communication servi...

and Section 6-8: Together ii Abstract Voice over IP over Wireless LAN (VoWLAN) is getting great attention from the industry and the products for VoWLAN deployment are emerging rapidly. Although technologies for carrying voice in IP networks have been advancing for years, carrying voice over wireless networks introduces new challenges. For end users, the performance of VoWLAN phones (802.11 phon...

Over the recent years enormous changes in the telecommunication services, techniques, regulations and markets have taken place. However, even with many new exciting services the telephony service is still popular. This paper provides empirical traffic data and observations of telephony traffic patterns in mobile and IP telephony. They are presented and compared with old telephony patterns from ...

In this paper, for the first time a heuristic network calculator for both whole-body exposure due to indoor base station antennas or access points (downlink exposure) and localised exposure due to the mobile device (uplink exposure) in indoor wireless networks is presented. As an application, three phone call scenarios are investigated (Universal Mobile Telecommunications System (UMTS) macrocel...