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The availability and reasonable cost of broadband Internet made it an attractive and favourable option to billions of users worldwide. Being a fast service also encourages its users to use real-time applications which is streaming and live data transfer includes VoIP and video streaming. The performance of such applications in Wireless Local Area Network (WLAN) may be highly affected by security protocols...
Currently and due to its wide use, the wireless networks in conformance with IEEE 802.11 standard are generating channels saturation, that provokes interference between themselves. IEEE 802.11n is one of the standards that offers greater benefits to improve the wireless network performance. In this paper we analyze the performance of wireless network in conformance with IEEE 802.11n standard to evaluate...
In the next generation of wireless networks, mobile users can move among heterogeneous networks, using terminals with multiple access interfaces and non-real-time or real-time services. The most important problem in such environment is the Always Best Connected (ABC) concept permitting the best connectivity to applications anywhere at anytime. In this paper, we compare the performance analysis network...
With the growth of data-capable, multi-interface wireless and mobile devices, a lot of research work is being done on handover management and network selection in heterogeneous environment. The goal is that a user should be able to select an appropriate wireless network according to its service requirements and seamlessly handover to that network regardless of the underlying wireless technology being...
Congestion control mechanisms include three phases: congestion detection, congestion notification and rate adjustment. So far diverse congestion detection methods for sensor networks are proposed. In this paper we introduce numerous congestion detection parameters and examine them in various respects; finally we choose one of them as the best parameter for video traffic in wireless sensor networks...
Estimating weight factors for QoS parameters plays an important role in the effectiveness of vertical handoff decision algorithms. This paper presents a novel weight estimation technique, which can adaptively control the spanning of the weights in response to user preference. Simulation results show the supremacy of the technique against the state-of-the-art in achieving wider spanning of the expected...
Increasing demands of ubiquitous services in wireless networks and evolution towards heterogeneous solutions has driven the necessity of developing efficient QoS aware vertical handoff (handoff between different networks) mechanisms. This paper proposes a QoS aware fuzzy rule based vertical handoff mechanism that makes a multi-criteria based decision, found to be effective for meeting the requirements...
Recently, network coding (NC) has been popularly applied to wireless networks in order to improve channel utilization. In wireless LANs, when NC is applied to packet retransmission, a base station can simultaneously retransmit multiple packets destined to different wireless stations for a single retransmission trial. On the other hand, NC creates additional packet delay at both base station and wireless...
Wireless Local Area Networks (WLANs) are experiencing higher data rate and radius coverage, making possible high quality audio and video transmission. An IPTV system can be built in any home using the Wireless IEEE 802.11n standard because it provides enough data rate and range than the other IEEE 802.11 variants. IEEE 802.1a/b/g standards do not offer enough bandwidth to provide several ITPV channels...
Heterogeneous wireless access networks (HWAN) will create a market for the delivery of an extensive collection of novel and attractive services and contents. Accounting and pricing the ubiquitous services will play a key role from both service providers and users point of view. By one hand, wireless service providers (WSP) look for the maximum revenue and utilization rate and by other hand users will...
Recently, Network Coding (NC) has been popularly applied to wireless networks in order to improve channel utilization. In wireless LANs, when NC is applied to packet retransmission, a base station can simultaneously retransmit multiple packets destined to different wireless stations for a single retransmission trial. On the other hand, at a receiver side, out-of-order packet reception can occur, and...
Cognitive Wireless Network (CWN) is expected as one of the most efficient transmission methods to solve today's wireless problems like the lack of wireless bands or the efficient usage of limited wireless resources. However, CWN have not established effective transmission methods considered with QoS or upper layers protocols yet. In this paper, selective transmission control method in cognitive wireless...
During the last couple of years, the trend towards mobile devices and wireless communication has continued. Today, the increased capabilities of these devices allow for a variety of multimedia applications. Interactive applications like gaming or teleconferencing have strict requirements regarding network latency, jitter and packet loss. However, wireless networks such as IEEE 802.11a/b/g have very...
With the ongoing progress of telecommunication has increased the want of mobility, wireless or mobile networks and this desire has already swapped the wired networks. The upcoming networks has totally different infrastructure and has different protocols and devices. These networks are infrastructure less and no dedicated protocols or devices are required to deploy such networks. The theme of this...
Traditional Time Division Multiple Access (TDMA) protocol provides deterministic periodic collision-free data transmissions. However, TDMA lacks flexibility and exhibits low efficiency in dynamic environments such as wireless LANs. On the other hand, contention-based MAC protocols such as the IEEE 802.11 DCF are adaptive to network dynamics but are generally inefficient in heavily loaded or large...
Real-time multiplayer games are a popular application of networks, and as IEEE 802.11 wireless networks are widely used, games are expected to be widely played on wireless networks. However, 802.11 networks with the normal MAC (DCF) may present some challenges when supporting real-time games traffic. In this work, we present a theoretical model which can predict the performance and capacity of 802...
Ensuring Quality of Service (QoS) in wireless networks poses an open problem in many application domains. We propose an automatic on-line QoS monitoring and management infrastructure that can be incorporated into existing network setups. Based on model-based assessment of current and future QoS conditions, our solution will control traffic in the network through a combination of admission control,...
As mobile wireless networks increase in popularity and pervasiveness, seamless mobility is an important issue for uninterrupted services in ubiquitous network environments. In this paper, we propose a zero packet loss handoff mechanism for real-time streaming services, which is based on the SIP protocol cooperated with mobile agent, multicast, and buffering technique to overcome the impact of handoff...
With the co-existence of different wireless networks, which exhibit largely different bandwidth and coverage characteristics, much interest has been involved in integrating these networks to support smooth and efficient multimedia services. In this paper, we present an analytical framework for variable-bit-rate (VBR) video streaming in a two-tier wireless network with VBR channels. We derive the expected...
This paper quantifies the performance degradation of video streaming over WLAN network (IEEE 802.11g) due to distance, obstacles and motion. Wireless networks are generally marked by the presence of noise and channel interferences which present an overhead to video quality. First, we present the research done on the metrics used for performance assessment which are: PSNR, transmission delay, jitter,...
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