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Even though different wireless Network Access Technologies (NAT) with different specifications and applications have been developed, no single wireless technology can satisfy the anytime, anywhere, and any service wireless access needs of mobile users. A real seamless mobile environment is only realized by considering vertical and horizontal handoffs together. One of the major design issues in heterogeneous...
Mobility support in IPv6 networks (MIPv6) and Fast Handovers for Mobile IPv6 (FMIPv6) are already released as RFCs for many years. While the former focuses on maintaining the network connections when a mobile node handovers across subnets, the latter is built based on the former concept, but focuses on reducing the packet loss and latency inherent to the handover process. Performance study of both...
This paper explores the possible effects on the performance of IEEE 802.11 when high-rate real-time applications such as video streaming are transmitted simultaneously with data over the network. While most of the studies conducted have been limited to 802.11b and 802.11g; this study focuses on the newer 802.11n. It considers the effect on performance parameters like throughput, jitter and packets...
TCP has been a congestion control method in the Internet. However, since TCP is not able to directly measure the network status from the end nodes, the TCP window control gradually increases the congestion window size until congestion occurs. This control gets network bandwidth aggressively and affects communication of all stations (STAs) which belong to the same access point of IEEE 802.11 standards...
This paper deals with measurements of the impact of fragmentation threshold tuning on speech quality and background traffic throughput in mixed voice/data transmission in an environment of WLANs (IEEE 802.11b). The ITU-T G.729AB encoding scheme is deployed in this study and the Distributed Internet Traffic Generator (D-ITG) is used for the purpose of the background traffic generation. The primary...
The importance of wireless communications, involving electronic devices, has been growing. Performance is a very relevant issue, leading to more reliable and efficient communications. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11 a, g) WEP point-to-point links. A contribution is given to performance evaluation of this technology, using available access points...
The importance of wireless communications has been growing. Wi-Fi and FSO are very important technologies in this context. Performance is a very relevant issue, leading to more reliable and efficient communications. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11 a, g) point-to-point links, namely at OSI levels 4 and 7. An FSO medium range link has been successfully...
Wireless communications using microwaves are increasingly important, e.g. Wi-Fi. Performance is a fundamental issue, resulting in more reliable and efficient communications. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11b, g) WEP point-to-point links using available access points from Enterasys Networks (RBTR2). Through OSI levels 4 and 7, detailed results...
The importance of wireless communications, involving electronic devices, has been growing. Performance is a crucial issue, leading to more reliable and efficient communications. Security is equally important. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11 a, b, g) WEP point-to-point links. A contribution is given to performance evaluation of this technology,...
Wireless technologies continue to play an increasing role in all kinds of networks. Wireless options are increasing and the cost of these technologies continues to decrease. It is anticipated that wireless networking of all types will become more prevalent in the years to come. However security and performance is a major concern. In this research, performance of wireless IEEE802.11n is evaluated on...
Wireless distributed systems (WDS) are used to interconnect a set of access points to form a wireless extended service set (ESS). In this paper, we investigate the performance enhancements accomplished by using multiple interface cards per AP within the WDS system. Detailed simulations are conducted to bring out the enhancements accomplished by just using a few interfaces per access point in terms...
Using indoor propagation measurements, the combined effect of received signal strength (RSS) and traffic type (i.e., voice and video) on the performance of a typical WLAN is investigated. In the investigation, both ad hoc and infrastructure network scenarios are used. Measurement results obtained show that RSS has a significant effect on the playback delays of voice and video traffic, especially under...
The importance of wireless communications, involving electronic devices, has been growing. Performance is a very important issue. Laboratory measurements are made about several performance aspects of Wi-Fi IEEE 802.11 b, g point-to-point links. A contribution is given to performance evaluation of this technology, using two types of access points from Enterasys Networks (RBTR2 and RBT-4102), and wireless...
Video streaming has become the application that drives the Internet to a new height. In this paper, we analyze and evaluate the performance of H.264-based video streaming over multi-hop wireless local area networks (WLANs). Contrary to common believes that adding relays in the same wireless channel may increase coverage but has to reduce throughput, our analysis and simulation results show a wide...
In recent years the interest in supporting voice over IP (VoIP) services over wireless local area networks (WLANs) based on IEEE 802.11 standard is growing. A key issue on this topic is to understand how well the 802.11 can support quality of service (QoS) for VoIP services. Recently ITU-T has released the E-model recommendation to evaluate voice quality perceived by users. In this paper we present...
We analyze and compare various transport protocols in the context of wireless in-vehicle IP-based audio and video communication. We determine the most appropriate transport protocol and discuss its benefits for an application in the car. The analyses are accomplished based on the IEEE 802.11 standard. A testbed is used to measure and compare quality of service values such as throughput, jitter and...
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