One of the central problems in video transmission over lossy channels is the choice of source and channel coding rates to allocate the available transmission rate optimally. In this paper, we present a structural distortion model for video streaming ...

Providing Internet access to Mobile Ad hoc Networks (MANETs) can greatly extend their applications, increase their scalability, and improve the quality of service. However, a critical problem is how the mobile hosts can locate Internet-based servers ...

With the recent development of wireless communications and multimedia systems, 3D image-based scenes with photo-realistic rendered images and rendering performance have recently received a great deal of interests.In this paper, we focus upon 3D scenes ...

The concept of care-of-address (CoA) is a major cause of excessive handoff delay in Mobile IPv6 for real time multimedia traffic. Many schemes eliminate the use of CoA at the micro-mobility scale, but leave the macro-mobility unsolved. This paper ...

The substitution of ATM transport by IP in future UMTS Radio Access Networks (UTRAN) introduces several performance challenges that need to be addressed to guarantee the feasibility of its deployment. The significant increase of the overhead requires of ...

In this paper, we analyze the effect of the retransmitted packet size preservation (RPSP) property. RPSP says that all transferred packets at (re-)transmissions (namely, transferred packets) have the same size as at the original transmission, that is, ...

This paper proposes a new method of balancing traffic load in mobile cellular networks by using Case-Based Reasoning (CBR) to learn traffic patterns at periods of congestion, the obtained traffic patterns then being used to control co-operating semi-...

In this paper we present a model for the joint congestion control, routing and MAC link access for ad hoc wireless networks. We formulate the problem as a utility maximization problem with routing and link access constraints. For the solution we exploit ...

Medium access control (MAC) protocols manage energy consumption on the network element during communication, which is the most energy-consuming event on Wireless Sensor Networks (WSNs). One method to mitigate energy consumption is to adjust transmission ...

Currently, large-scale deployments of mesh networks are being planned for Philadelphia as well as other cities. The performance of such networks has never been examined through simulation or through any other means. In this paper we perform detailed ...

Topology Control (TC) is a well-studied technique used in wireless ad hoc networks to find energy-efficient and/or low-interference subgraphs of the maxpower communication graph. However, existing work has the following limitations: (1) the energy model ...

This work describes a detailed simulation-based study of the performance of an IEEE 802.11e Medium Access Control (MAC) layer over an IEEE 802.11g Physical (PHY) layer. The study focuses on the number of simultaneous bidirectional G.711 Voice over IP (...

The increase of IEEE 802.11's bandwidth led to a deployment of many multimedia applications over wireless networks. Nevertheless, these applications impose stringent constraints in QoS. In this context, a lot of works have been proposed in order to ...

Wireless mesh technology is receiving growing attention. Multi-hop operation can be implemented in high quality multi-media communication systems to achieve cost efficiency. However, hidden and exposed stations which commonly appear in mesh environments ...

In [3], it was shown that the optimal throughput scaling in wireless multihop networks is achieved using slotted Aloha, and quantitative performance results for this protocol were derived under the assumption of exponentially distributed transmission ...

Wireless sensor networks (WSN) provide an inexpensive and convenient way to monitor physical environments. Integrating the context-aware capability of WSN into surveillance systems is an attractive direction. We thus propose an <u>i</u>ntegrated <u>mo</...

Discrete-event network simulation is a major tool for the research and development of mobile ad-hoc networks (MANETs). These simulations are used for debugging, teaching, understanding, and performance-evaluating MANET protocols. For the first three ...

Wireless Actor and Sensor Networks (WSANs) are increasingly being deployed for fine-grain monitoring of physical environments subjected to critical conditions such as fire, leaking of toxic gases and explosions. A great challenge to these networks is to ...

In present wireless networks, mobile users frequently access continuous and session-oriented Internet services. During the handover, the management of session-related information introduces additional overheads and delays, due to context transfer ...

We propose an information-sharing application for wireless intervehicular networks (IVNs), called Infoshare. The Infoshare application leverages the broadcast nature of the wireless medium to achieve maximum spreading of information queries among ...