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Mobile users' demand for using the best available network connection encourages mobile network operators (MNOs) to construct multi-access networks managed by all-IP based mobile networks. For such an MNO, the IP Multimedia Subsystem (IMS) is a promising service control infrastructure to provide IP-based multimedia services with QoS guarantee in the multi-access network. The service centralization...
Recently, the demanding requirements and use for wireless communication are increased and continue to grow. WiBro is trying to compete with Wi-Fi in coverage and data rate, while the inexpensive Wi-Fi still very popular in both personal and business use. This paper designs and implements Fixed Mobile Convergence (FMC) terminal system supported IEEE802.11 b/g/n Wi-Fi and WiBro. Terminal system of this...
This paper introduces the system concept and specifications for an enhanced version of the Wireless IP Access System (WIPAS), the Advanced WIPAS, which is a fixed wireless access (FWA) system that provides higher speed and real-time communication for triple play services: broadband IP service, 4class Quality of Service (QoS) especially VoIP services, and multicast HDTV video transmission services...
Undergraduate courses for data communications and telecommunications cover services from a network technology perspective more so than they cover network technologies from a service perspective. Thus, critical issues such as interoperability and end-to-end system integration in support of new service and application ideas are left unexplored until post graduation, on-the-job training. Up until now,...
In this article we study the behavior of voice over IP traffic in IEEE 802.11 wireless networks. Specifically, we design a QoS provisioning mechanism for VoIP traffic, and propose a practical solution of configuring the 802.11e enhanced distributed control access parameter sets for different types of traffic. We show that media access control layer only methods may be insufficient, but the demonstrated...
This paper presents the results of our computer simulation for delays experienced by voice packets over WiMAX 802.16e protocol running over an enterprise packet network connected to public internet. In the simulation we analyzed the effect of packet size, core network link speed, Internet service provider link speed, wireless network link speed, wireless distance, base station range, and distance...
With growth of Internet and wireless IP network, multimedia systems can be accessed from any-where and anytime. However, efficient real-time services are open and challenging research problem. To implement real-time services such as VoIP over wireless access network, IP header compression scheme can be used for saving bandwidth. Enhanced compressed RTP (ECRTP) has been used for lossy link and high...
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