SATNAC 2008 Conference Papers
Network Services
Title: A Study of the Energy
Consumption of Security Encryption Policies in Wireless Devices
Authors: Dawoud
Dawoud (
Abstract: Security is becoming an everyday concern for a wide range of electronic systems that manipulate, communicate, and store sensitive data. An important and emerging category of such electronic systems are battery-powered mobile appliances, such as personal digital assistants and cell phones, which are severely constrained in the resources they possess, namely, processor, battery, and memory. This work focuses on one important constraint of such devices—battery life—and examines how it is impacted by the use of various security mechanisms. In this paper, we first present the cryptographic primitives needed to secure wireless communication. We then discuss the impact of the main parameters of the cryptographic algorithms on the overall energy consumption for secure data transactions. We then analyze the performance of different security encryption protocols set in a wireless access point regarding energy consumption. Our research focused mainly on Static WEP, 802.1x-EAP-TLS-WEP128, and 802.1x-EAP-TLS-TKIP. We compared the performance of those security encryption protocols by measuring the power consumed on a laptop.
Title: Measuring Performance
Impact of Authentication and Encryption Protocols on a Wireless LAN
Authors: Dawoud
Dawoud (
Abstract: Wireless Local Area Networks (WLANs) found a wide spread in all aspects of life because of low cost and also because it adds mobility and flexibility on the network. Wireless transmission is vulnerable to eavesdropping, the matter that gives attackers greater incentives to step up their efforts to gain unauthorized access to the information being exchanged over the wireless link. The security of the data during transmission represents the most important requirement in a wireless network. However there is a cost while deploying security on a system in terms of network throughput and response time. In this work, the IEEE 802.1x and EAP-TLS authentication along with WEP, TKIP for data traffic encryption was studied then configured on a test-lab network. Measurements were carried out to measure the overhead associated with applying different security policies on the performance of the network. The goal of this work is to measure the encryption and authentication overhead associated with IEEE 802.11 security protocols. The results showed that encrypting data traffic reduces slightly network traffic and using IEEE 802.1x with EAP-TLS for authentication increases slightly the authentication time.
Title: A Model of Autonomous
Motion in ad hoc Networks to Maximise Area Coverage
Authors: Anthony
Krzesinski (
Abstract: Ad hoc networks are self-configuring networks of mobile nodes, connected by wireless links. If a destination node is beyond the transmission range of an origin node, then the nodes cooperate to provide a multi-hop route. Suppose each mobile node can make observations within a circular area centred on its own location. The coverage of the network is defined as the total area observed by the mobile nodes. We investigate a distributed scalable method whereby the nodes move autonomously (self-deployment) in order to maximise the coverage of the network, while at the same time ensuring that the mobile nodes do not move so far away from each other (thus trivially maximising the coverage) that they become disconnected. Certain nodes may be instructed to move to specified locations. These guide nodes induce a a correlated movement of groups of nodes which follow the guide nodes and establish maximal coverage in the specified vicinities. Simulation results demonstrate the coverage achieved by a group of 100 nodes when moving on an unbounded plane (optional guide nodes induce a collective motion to areas of interest) and when moving on a bounded plane with barriers or hills.
Title: Utilizing Scalable
Video Encoding for Adapted Video Delivery in Next Generation Networks
Authors: Robert
Marston (
Abstract: Multimedia
services will be the dominant services provided by Next Generation Network
(NGN) architectures and judging by the success of video services in the
Internet, future multimedia applications will be heavily video dependent. Due
to the heterogeneous nature of the access networks and the range of end
terminal devices that will connect with NGNs, video services will be required
to adapt video content to suit the needs of individual clients. Current
adaptation techniques such as transcoding and redundant storage of video files
are inefficient and not easily scalable. The recently completed H.264/MPEG4-AVC
Scalable Video Coding (SVC) amendment allows for extraction of multiple quality
layers with varying spatial, temporal and quality attributes from a single
video encoding, allowing the video content to be quickly adapted to meet
differing requirements. In this paper we present a video streaming solution
that utilizes the H.264/MPEG-AVC scalable amendment in order to adapt video
sequences without the need for transcoding or multiple encodings of the video.
An initial prototype implementation for the IP Multimedia Subsystem NGN is
outlined and the prototype’s performance contrasted with that of current
adaptation techniques. The results obtained from this prototype show that the
use of H.264 scalable encoding allows for a much more efficient and scalable
solution for video streaming services in NGNs.
Title: An Example of a Simple
Cache system for a Video Streaming Implementation within a Network Simulation
Authors: Patrick Mulumba (
Abstract: The modern expansion of public streaming has played a considerable part in the growth of distributed multimedia, with special reference to video. However, since the Internet is an inter-connected web of different network speeds, streaming video is still a difficult service to implement to all locations. This paper illustrates two simple simulated network streaming environments. The first models a broadcast network and the second model represents a multicast network. A simple cache system is then implemented into these models to investigate whether a significant difference exists between the cache size and the different network bandwidths of these two optimization systems. This caching system will then be used to compare the impact of videos (characterised by different resolutions and degrees of picture motion) on the cache performance.
Title: Resource Optimization
for Converging Wireless Networks
Authors: Oladayo
Salami (
Abstract: Next
generation wireless networks are evolving from the inter-working of existing
wireless networks. The inter-working of these networks conveniently brings
about ubiquitous broadband internet access required by network users. However,
the major concerns in inter-working wireless networks include how to ensure
effective resource dimensioning and quality of service (QoS) provisioning while
optimizing the overall network’s resources. Although Traffic Engineering
(TE) frameworks are used to overcome such network issues, a few of these
frameworks are suitable for wireless networks. More so, there is virtually no
TE framework for inter-working wireless networks. In addition most TE
frameworks focus only on network layer metrics, which makes them inapplicable
to wireless networks. Due to the stochastic nature of wireless networks, TE
frameworks which capture metrics that affects QoS from other layers of the
network are needed. Hence, this paper proposes a Multi-layer TE framework for
QoS provisioning, resource dimensioning and optimization in inter-working
wireless networks. The proposed framework is based on Stochastic Network
Calculus.
Title: Network Discovery and
Selection in Heterogeneous Environment: South Africa Case Study towards 2010
Authors: Clifford
Sibanda (
Abstract: The standard developments by
the IEEE802.21 Working group that seeks to see mobility across heterogeneous
networks a reality, have earnestly picked up pace. With the variety of
available networks the mobile node may be faced with the decision of which
network to connect to. In developed countries where resources, interconnect
arrangements are not a problem and pricing is almost standard across networks
this decision has mostly been advertised as the Always Best Connected (ABC),
however in developing countries, more so in the African perspective, this may
not be the best solution. We use