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University of Cape Town
(79 results)-
Whitepapers
WiFi Hotspot Network Monitoring Tool: Project Proposal
May 18, 2009, 12:00am PDT
Wireless Fidelity (Wi-Fi) is a wireless networking technology that uses radio waves to provide high-speed, wireless internet and network connections. This technology is based on the IEEE 802.11...
Provided by University of Cape Town
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Case Studies
Case Study 7 Interactive Spreadsheets
November 1, 2008, 12:00am PDT
This case study speaks about the perceptions of students about Statistics. The subject is generally considered difficult and intensive by the students. The paper seeks to increase students'...
Provided by University of Cape Town
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White Papers
Economic Mechanisms for Protecting VoIP Services Within the IMS
July 14, 2008, 12:00am PDT
The IP Multimedia Subsystem (IMS) is the proposed Next Generation Network (NGN) architecture that will be used to provide revolutionary services based on an IP backbone. For successful IMS...
Provided by University of Cape Town
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White Papers
Telemedicine Using VoIP Combined With a Store and Forward Approach
January 1, 2010, 12:00am PST
Rural areas in South Africa have unique conditions such as remoteness and scarcity of reliable public facilities. Information and Communication Technologies (ICTs) introduced into these areas must...
Provided by University of Cape Town
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White Papers
An Evaluation of Architectures for IMS Based Video Conferencing
July 12, 2008, 12:00am PDT
The IP Multimedia Subsystem is an architectural framework for delivering multimedia services over an Internet Protocol (IP) network. Originally, it was specified for wireless networks, but has...
Provided by University of Cape Town
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White Papers
Implementing Performance Budgeting in South Africa
November 9, 2007, 12:00am PST
South Africa, like many other countries, has adopted performance budgeting as a system to improve budget planning and financial management. The implementation of performance budgeting is expected...
Provided by University of Cape Town
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White Papers
The Importance of Trust and Risk in M-Commerce: A South African Perspective
July 21, 2009, 12:00am PDT
Despite the hype associated with m-commerce and the massive revenue predictions by research companies, current adoption figures by consumers seem to demonstrate a lack of enthusiasm for more...
Provided by University of Cape Town
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White Papers
Mobile Cloud Computing: Embracing Network as a Service
June 7, 2010, 12:00am PDT
The recent emergence of Cloud Computing in the IT world has brought much hype and opened doors for new revenue streams and business models. The movement towards an all IP-based communication...
Provided by University of Cape Town
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White Papers
Modelling Channel Error in IEEE 802.11 Networks
July 19, 2010, 12:00am PDT
Modeling the performance of IEEE 802.11 networks has been done since the standard first appeared. Most of the models assume saturated traffic conditions and do not distinguish between traffic...
Provided by University of Cape Town
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White Papers
Financial Development And Inequality: Brazil 1985-1994
July 15, 2008, 12:00am PDT
The authors examine the impact of financial development on earnings in-equality in Brazil in the 1980s and first half of the 1990s. The evidence -based on panel time-series data and analysis-shows...
Provided by University of Cape Town
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White Papers
The Price Of Risk On The JSE
June 1, 2007, 12:00am PDT
This paper investigates domestic risk-return behavior by focusing on the intertemporal relationship between the conditional domestic equity market premium, its conditional variance and its...
Provided by University of Cape Town
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White Papers
Labor Supply Responses To Large Social Transfers: Longitudinal Evidence From South Africa
September 1, 2007, 12:00am PDT
The South African old-age social pension has been much studied by both researchers and policy makers, in part for the larger lessons that might be learned about behavioral responses to cash...
Provided by University of Cape Town
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White Papers
A Theoretically Defensible Measure Of Risk: Using Financial Market Data From A Middle Income Context
November 15, 2007, 12:00am PST
While economic theory assumes that risk is of central importance in financial decision making, it is difficult to measure the uncertainty faced by investors. Commonly used empirical proxies for...
Provided by University of Cape Town
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White Papers
Exchange Rate Determination Under Monetary Policy Rules In A Financially Underdeveloped Economy: A Simple Model And Application to Mozambique
September 29, 2010, 12:00am PDT
Microstructure aspects of nominal exchange rate determination are less relevant in countries with embryonic financial markets. In less-developed economies, trade in goods and services is a more...
Provided by University of Cape Town
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White Papers
Exploring The Relationship Between Network Competence, Network Capability, And Firm Performance: A Resource Based Perspective In An Emerging Economy
August 18, 2008, 12:00am PDT
Growing attention to business-to-business networks and the demonstrated linkage between firm performance and collaborative efforts within these networks, fuels the continued search for a greater...
Provided by University of Cape Town
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White Papers
Relationship Or Innovation Orientation In B2B Markets: Empirical Results From An Emerging Market
September 1, 2009, 12:00am PDT
Market orientation and innovation orientation, including their relationship with firm performance, are well-debated in prevailing marketing literature. Interestingly, relationship orientation, as...
Provided by University of Cape Town
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White Papers
Exploring the Use of Discrete Gestures for Authentication
July 4, 2009, 12:00am PDT
Research in user authentication has been a growing field in HCI. Previous studies have shown that people's graphical memory can be used to increase password memorability. On the other hand, with...
Provided by University of Cape Town
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White Papers
South African Mining Equipment And Related Services: Growth, Constraints And Policy
March 1, 2011, 12:00am PST
Like many other developing economy regions, Africa is benefitting from a sustained boom in commodities prices. Received wisdom has been that commodities production is an inherently enclave...
Provided by University of Cape Town
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White Papers
Economic Growth In South Africa Since The Late Nineteenth Century
July 14, 2009, 12:00am PDT
The analysis has identified the sources of economic growth in South Africa against the backdrop of international economic developments. Between 1870 and 1914, the international regime was one of...
Provided by University of Cape Town
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White Papers
Evaluation of Interference in Inter-Working Multi-Hop Wireless Networks
October 1, 2010, 12:00am PDT
The consequence of simultaneous transmissions by nodes in inter-working multi-hop wireless networks is inter-node interference. Inter-node interference is a metric that is important for the...
Provided by University of Cape Town
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White Papers
Analysis of Network Operators' Revenue With a Dynamic Pricing Model Based on User Behavior in NGWN Using JCAC
July 19, 2010, 12:00am PDT
Next generation of wireless networks are expected to be heterogeneous, whereby multiple radio access technologies will work together in a coordinated fashion. These networks will be required to...
Provided by University of Cape Town
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White Papers
Performance Evaluation of Low-Complexity Decision-Feedback Detector for SM-MIMO-OFDM Systems
July 19, 2009, 12:00am PDT
Spatially Multiplexed Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (SM-MIMO-OFDM) technology is envisaged to raise transmission capacity over the wireless channels up...
Provided by University of Cape Town
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White Papers
Channel Capacity Performance of Transmit Antenna Selective MIMO System in Weibull Fading
July 15, 2009, 12:00am PDT
Multiple-Input Multiple-Output (MIMO) systems play a great role in improving communication in wireless systems. But an increase in the number of antennas used in a communication system results in...
Provided by University of Cape Town
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White Papers
Performance Evaluation of IMS Multimedia Over WiMAX
July 20, 2009, 12:00am PDT
Telecommunication networks have evolved steadily to meet the ever increasing demand of users. Hence, the Internet Protocol Multimedia Subsystem (IMS) will make it possible to provide ubiquitous...
Provided by University of Cape Town
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White Papers
Linear Detector Performance in Ill-Conditioned MIMO OFDM Channels
July 27, 2009, 12:00am PDT
This paper investigates the performance of linear detector based receivers in MIMO OFDM systems. Two linear detectors are compared that is: Zero Forcing (ZF) and the Minimum Mean Square Error...
Provided by University of Cape Town
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White Papers
End-to-End QoS Control for an ALL-IP (NGN) Platform Using WiMax as an Access Layer Network
July 19, 2009, 12:00am PDT
Telecommunications networks are evolving towards an integrated ALL-IP architecture, commonly known as the Next Generation Network (NGN). The architecture consists of broadband transport...
Provided by University of Cape Town
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White Papers
Handover Optimization in Heterogeneous Wireless Networks: PMIPv6 Vs. PMIPv6 With MIH
July 20, 2009, 12:00am PDT
Next generation wireless networks are expected to integrate and coordinate heterogeneous communication networks to enable network access ubiquity. Unfortunately, this integration of different...
Provided by University of Cape Town
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White Papers
A Connectivity Model for Inter-Working Multi-Hop Wireless Networks
July 20, 2009, 12:00am PDT
In inter-working multi-hop wireless networks, establishing resilient connectivity between source-destination node pairs is a major issue. The issues of connectivity in multi-hop wireless networks...
Provided by University of Cape Town
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White Papers
A Direct Marketing Platform for IMS-Based IPTV
July 15, 2009, 12:00am PDT
The widespread adoption of the IP Multimedia Subsystem (IMS) by operators faced many challenges. Currently, telephone companies (telcos) all over the world are rolling out Next Generation Networks...
Provided by University of Cape Town
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White Papers
Understanding Channel Saturation in Multi-Channel MAC Systems
July 20, 2009, 12:00am PDT
Multi-channel MAC systems offer high capacity, a prerequisite for the next generation networks. High capacity will ensure that the requirements of delay sensitive and time bounded flows are met....
Provided by University of Cape Town
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White Papers
The Use of NGN/IMS for Cloud and Grid Services Control and Management
July 17, 2009, 12:00am PDT
The ETSI Technical Committee (TC) GRID is addressing issues associated with the convergence of IT and Telecommunications, with particular reference to the lack of interoperable Grid solutions. The...
Provided by University of Cape Town
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White Papers
Call Admission Control With Pricing to Ensure Revenue for Network Operators While Providing QoS in Heterogeneous Networks
January 1, 2011, 12:00am PST
Heterogeneous networks are the next generation of wireless networks. They are envisioned to offer high data rates and multimedia services. Additionally, they are intended to offer services to...
Provided by University of Cape Town
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White Papers
A Context-Oriented Service Brokering Platform for the IP Multimedia Subsystem
July 21, 2010, 12:00am PDT
The rise of Web 2.0 applications has led to the need for the evolution of the Telecommunications business model. In this paper, the authors have proposed a context-oriented Service Brokering...
Provided by University of Cape Town
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White Papers
Joint Source-Network-Channel Coding for Multimedia Communications
July 20, 2010, 12:00am PDT
In this paper, a joint optimisation of source, channel and network coding is designed using network coding approach. This is necessary for optimal allocation of network resources at different...
Provided by University of Cape Town
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White Papers
Towards Improved TCP-Friendly Rate Adaptation for Real-Time Applications Using Adaptive Filters
July 16, 2010, 12:00am PDT
The emergence of multimedia applications has spurred interest in transport protocols with flexible transmission control. In TCP-Friendly Rate Control (TFRC), the multimedia transmission rate is...
Provided by University of Cape Town
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White Papers
A Hybrid Network/Host Mobility Management Scheme for NGNs
July 19, 2010, 12:00am PDT
Next Generation Networks are becoming more and more converged. Like the System Architecture Evolution (SAE) which encourages Fixed Mobile Convergence. It is a packet switched network which...
Provided by University of Cape Town
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White Papers
Efficient Multicasting for Conferences Using MANETs
June 7, 2010, 12:00am PDT
This paper mainly presents a motivation for research to be done on multicast protocols for Mobile Ad hoc NETworks (MANETs). In particular, the paper argues why the existing multicast protocols are...
Provided by University of Cape Town
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White Papers
Admission Control and Packet Scheduling for IEEE 802.16 Standards
June 7, 2010, 12:00am PDT
Admission control and packet scheduling mechanisms are used in service differentiation and QoS support. Implementation of these mechanisms in IEEE 802.16 is vendor specific. This paper states the...
Provided by University of Cape Town
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White Papers
Contradictions in Power Loading and Pilot Patterns in NC-OFDM Cognitive Radio Systems
June 4, 2010, 12:00am PDT
Cognitive Radio (CR) is seen as the next paradigm in radio communications and as a practical solution to the problem of spectrum scarcity. Non-Contiguous Orthogonal Frequency-Division Multiplexing...
Provided by University of Cape Town
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White Papers
Scalable Video Streaming Server for Mobile WiMAX
June 8, 2010, 12:00am PDT
The advancements in high-speed networks and video technology have made it technologically and economically feasible to provide video streaming. Among existing wireless standards, WiMAX provides...
Provided by University of Cape Town
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Whitepapers
Large Scale Metadata Harvesting Over Low Bandwidth Connections
March 10, 2010, 12:00am PST
There seems to be a widespread perception that large scale metadata harvesting requires a large amount of bandwidth. In this paper, a simple Python-based metadata harvester was created and run...
Provided by University of Cape Town
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White Papers
Immediate Detection of Anomalies in Call Data - An Adaptive Intelligence Approach
June 26, 2007, 12:00am PDT
Anomaly detection in telecommunications call data tries to discover deviant behaviour of individual subscribers. Malicious behaviour has been noted as one of the key causes of such anomalies,...
Provided by University of Cape Town
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White Papers
A Joint IEEE802.21 and Cross Layer Model
June 27, 2007, 12:00am PDT
In the near future devices will be required to roam across heterogeneous networks with seamless ease. These devices have to contend with problems of heterogeneity inherent in the different link...
Provided by University of Cape Town
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White Papers
An Evaluation of SIP Based Mobility in the IP Multimedia Subsystem
July 15, 2008, 12:00am PDT
Mobility will be the cornerstone of any Next Generation Architecture. Users will expect seamless mobility across available access networks without visible degradation of ongoing multimedia...
Provided by University of Cape Town
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White Papers
An Emission and Discard Priority Scheme for OBS Networks
July 22, 2008, 12:00am PDT
A key issue in Optical Burst Switched (OBS) networks is resolving burst contention in an efficient and cost-effective manner. Although deflection routing has been identified as a cost-effective...
Provided by University of Cape Town
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White Papers
Route Selection Impacts on Achieving Enhanced IMS QoS
July 5, 2008, 12:00am PDT
The different planes in the IMS interact via specific reference points to deliver multimedia services to the user. QoS provisioning for IMS communications has been standardized for access networks...
Provided by University of Cape Town
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White Papers
Network Discovery and Selection in Heterogeneous Environment: South Africa Case Study Towards 2010
July 14, 2008, 12:00am PDT
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...
Provided by University of Cape Town
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White Papers
Utilizing Scalable Video Encoding for Adapted Video Delivery in Next Generation Networks
July 14, 2008, 12:00am PDT
Multimedia services are the cornerstone of the Next Generation Network (NGN) architectures and judging by the success of video services in the Internet, future multimedia applications will be...
Provided by University of Cape Town
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White Papers
Performance and Possible Deployment of HTTP Session Mobility Service Using SIP
July 22, 2008, 12:00am PDT
This paper presents results of the implementation of HTTP Session Mobility Service using SIP. The results are based on HTTP session mobility test on some notable websites. More precisely, web...
Provided by University of Cape Town
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White Papers
Linking Session Based Services and Transport Layer Resources in the IP Multimedia Subsystem
July 10, 2008, 12:00am PDT
The Web 2.0 Internet revolution has introduced a new communications model, introducing a new age of community based websites with millions of empowered and contributing users exploiting the wisdom...
Provided by University of Cape Town
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White Papers
Practical Evaluation of a Spam Prevention Architecture for IMS Networks
July 22, 2008, 12:00am PDT
Telecommunications technologies are advancing rapidly particularly in the field of mobile telephony. Improved network architectures will provide cheaper, more accessible mobile communication, but...
Provided by University of Cape Town
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White Papers
A Converged IMS Client for the IP Multimedia Subsystem
July 19, 2010, 12:00am PDT
The IP Multimedia Subsystem (IMS) has been developed to provide a single platform that offers many different converged services, over multiple access technologies, with several different end user...
Provided by University of Cape Town
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White Papers
Charging in IP Multimedia Networks
July 20, 2010, 12:00am PDT
IMS charging can be performed at various planes of the IMS architecture. Different charging schemes may be utilized. The optimal charging scheme would be service dependent, but may also be...
Provided by University of Cape Town
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White Papers
TransferHTTP+CAS: Latency and Memory Tests
July 12, 2010, 12:00am PDT
Convergence in the Internet, Telecommunication and Broadcasting is generating new services over the Internet. The online experience is getting improved via the introduction of user profile...
Provided by University of Cape Town
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White Papers
Improvement of FMIPv6 Handover Performance Using MIH and Timely Link Layer Triggers
July 1, 2010, 12:00am PDT
The Mobile IPv6 for Fast Handovers (FMIPv6) solution aims at reducing the handover latency and packet loss experienced in MIPv6. It achieves this reduction by applying fast movement detection and...
Provided by University of Cape Town
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White Papers
A Framework to Provide Charging for Composite Services
May 3, 2010, 12:00am PDT
Changing telecommunications market trends calls for the evolution of service creation and delivery by network operators. They need to maximize on any available form of revenue creation to avoid...
Provided by University of Cape Town
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White Papers
Investigating a Reduced Size Real-Time Transport Protocol for Low-Bandwidth Networks
August 9, 2011, 12:00am PDT
Optimization of bandwidth usage for video streaming is of paramount importance in networks where low bitrate links are typical. Among the solutions proposed to address this problem is header...
Provided by University of Cape Town
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White Papers
Real-Time Performance Evaluation of Media Pipeline Plug-In Architectures
August 5, 2011, 12:00am PDT
Deployment of real-time applications has become ubiquitous in recent years. These applications (e.g. streaming video over the Internet) however, are processor-intensive and require fast...
Provided by University of Cape Town
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White Papers
Fast Implementation of Block Motion Estimation Algorithms in Video Encoders
May 6, 2011, 12:00am PDT
Block Matching Algorithms (BMA) are central to optimal frame prediction for motion estimation in video compression. This paper focuses on the efficiency of Hierarchical Search (HS) algorithms. The...
Provided by University of Cape Town
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White Papers
LTSP DNS Round Robin Clusters: Green Technology Access Enablers for Telecommunication Services in Marginalised Communities
August 19, 2011, 12:00am PDT
Rural development is seen as a priority in South Africa; information and knowledge are key strategic resources for social and economic development. Information Communication Technologies (ICTs)...
Provided by University of Cape Town
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White Papers
Multi-Radio Access Selection to Reduce Reorder Buffer Requirements in Heterogeneous Wireless Networks With Multi-Homed Mobile Terminals
August 22, 2011, 12:00am PDT
Aggregating bandwidth from multiple Radio Access Technologies (RATs) provides an opportunity for network providers to enhance network capacity. This is important for serving applications that...
Provided by University of Cape Town
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White Papers
An Efficient Connection Admission Control (CAC) for QoS Provisioning in IEEE 802.16
October 18, 2011, 12:00am PDT
Service differentiation and QoS support are important aspects of Connection Admission Control (CAC) in IEEE 802.16 networks, which is left for vendors to design and implement for efficient...
Provided by University of Cape Town
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White Papers
Downlink Packet Scheduling for Variable Bitrate Traffic in LTE Networks
August 11, 2011, 12:00am PDT
In recent years, there has been a sharp increase in the demand for real-time multimedia applications from mobile subscribers. Voice and video are the most common forms of network traffic used in...
Provided by University of Cape Town
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White Papers
Enhanced Distributed Mobility Management Schemes for NGWNs
August 18, 2011, 12:00am PDT
The IETF IP working group is working on the solutions to address the deployment of current IP mobility management in a distributed and dynamic mobility management approach. The paper is aimed at...
Provided by University of Cape Town
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White Papers
A Real-Time Charging Platform for Converged Multimedia Services
August 4, 2011, 12:00am PDT
Network operators can achieve rapid service proliferation by exposing their networks to external content and service providers. The authors would create interfaces that would allow these service...
Provided by University of Cape Town
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White Papers
A Highly Scalable Monitoring Tool for Wi-Fi Networks
August 4, 2011, 12:00am PDT
The paper introduces a monitoring tool that was designed for an existing network of Wi-Fi hotspots. This was done by adding data collection and visualization components to the existing network....
Provided by University of Cape Town
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White Papers
Real-Time Bandwidth Encapsulation for IP/MPLS Protection Switching
June 7, 2010, 12:00am PDT
MPLS fast reroute achieves fast protection switching times ideal for the recovery of real-time multimedia traffic. The paper proposes to guarantee real-time protection of multimedia traffic by...
Provided by University of Cape Town
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White Papers
Analysis of Route Availability in Inter-working Multi-hop Wireless Networks
June 22, 2009, 12:00am PDT
In order to link a source-destination node pair in inter-working multi-hop wireless networks, links or routes must first be available. It is only after establishing the availability of links and...
Provided by University of Cape Town
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White Papers
Link and Route Availability for Inter-working Multi-hop Wireless Networks
April 20, 2009, 12:00am PDT
In inter-working multi-hop wireless networks, establishing resilient connectivity between source-destination node pairs is a major issue. The issues of connectivity in multi-hop wireless networks...
Provided by University of Cape Town
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White Papers
A Biomimetic Ranking System for Energy Constrained Mobile Wireless Sensor Networks
June 22, 2007, 12:00am PDT
Routing in highly mobile, energy constrained wireless networks remains an open research area. The majority of energy aware protocols are designed for stationary networks, and conversely, mobile ad...
Provided by University of Cape Town
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White Papers
EcoLocate: A Heterogeneous Wireless Network System for Wildlife Tracking
January 22, 2008, 12:00am PST
All research to date using wireless networks for wildlife tracking has concentrated on monitoring a single species, using large GPS enabled collars. These collars are too heavy to attach on...
Provided by University of Cape Town
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White Papers
A Measurement-Aided Model-Based Admission Control Scheme for IEEE 802.11e EDCA Wireless LANs
July 28, 2008, 12:00am PDT
The IEEE 802.11e standard was introduced to overcome the lack of QoS support for the legacy IEEE 802.11 WLANs. It enhances the Media Access Control (MAC) layer operations to incorporate service...
Provided by University of Cape Town
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White Papers
Optimized Handover Delay in Proxy Mobile IPv6 Using IEEE802.21 MIH Services
July 9, 2008, 12:00am PDT
Recent trends are showing fast convergence of mobile and wireless communication networks with internet services to provide ubiquitous access to network users. It is envisioned that these next...
Provided by University of Cape Town
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White Papers
Load-Balancing in Heterogeneous Wireless Networks Implementing a User-Centric Joint Call Admission Control Algorithm
July 11, 2008, 12:00am PDT
Next Generation Wireless Networks (NGWN) will be heterogeneous and it is envisioned that Joint Call Admission Control (JCAC) algorithms for NGWN will be user-centric. User centricity implies that...
Provided by University of Cape Town
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White Papers
A Dynamic Channel Assignment Scheme for Multi-Radio Wireless Mesh Networks
July 29, 2008, 12:00am PDT
This paper investigates the challenges involve in designing a Dynamic Channel Assignment (DCA) scheme for wireless mesh networks, particularly for multi-radio systems. It motivates the need for...
Provided by University of Cape Town
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White Papers
Efficient Adaptive Radio Resource Management Algorithms for Next Generation Wireless Systems
July 15, 2008, 12:00am PDT
The need for optimised utilisation of scarcely available radio resources is prevalent. An efficient use of radio resources could lead to higher spectral efficient transmission on wireless...
Provided by University of Cape Town
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White Papers
Sensor Network Discovery for Deep Mining
June 7, 2010, 12:00am PDT
AziSA is an architecture for open measurement defined by the CSIR. It makes use of Wireless Sensor Networks (WSN) to provide a mechanism of recording data from drill and blast mining environments....
Provided by University of Cape Town
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White Papers
Scalable Video Streaming Server for Mobile WiMAX
June 8, 2010, 12:00am PDT
The advancements in high-speed networks and video technology have made it technologically and economically feasible to provide video streaming. Among existing wireless standards, WiMAX provides...
Provided by University of Cape Town
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White Papers
Contradictions in Power Loading and Pilot Patterns in NC-OFDM Cognitive Radio Systems
June 4, 2010, 12:00am PDT
Cognitive Radio (CR) is seen as the next paradigm in radio communications and as a practical solution to the problem of spectrum scarcity. Non-Contiguous Orthogonal Frequency-Division Multiplexing...
Provided by University of Cape Town
-
White Papers
Admission Control and Packet Scheduling for IEEE 802.16 Standards
June 7, 2010, 12:00am PDT
Admission control and packet scheduling mechanisms are used in service differentiation and QoS support. Implementation of these mechanisms in IEEE 802.16 is vendor specific. This paper states the...
Provided by University of Cape Town
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