Vitalis G. Ozianyi

• PhD
• Lecturer at Strathmore University

Road accidents are a major cause of injuries and death in developing countries. It is crucial to build a road accident database and data retrieval system as a fundamental resource in improving road safety. Since the accident database needs to hold reliable data, accurate methods for accident data collection must be used. This study focuses on impro...

Service outsourcing is a mechanism that allows competing operators to share network capacity and provide services to their subscribers for mutual benefit. An operator (custodian) who is experiencing an overshoot in the peak demand for network resources can negotiate an SLA with a competing but federated network (candidate) to provide network access...

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 influenced by user expectations. The 3GPP has standardized charging mechanisms, protocols and interfaces for IMS charging control; online and offline charging ha...

In a saturating telecommunications marketplace network operators want to rapidly deploy services with minimum capital investment, while maximizing on revenue from service usage by customers. One way to achieve this is to create interfaces for 3rd party service and content providers to offer their applications and services to users. Composing and bu...

The adoption of the IP Multimedia Subsystem (IMS) has faced a number of challenges. Furthermore, countries with developing infrastructure face additional difficulties. It is important for such countries to overcome these obstacles in order to adopt Next Generation Network (NGN) architectures and compete globally with operators offering IMS services...

The pricing and charging mechanisms used in Next Generation Network (NGN) deployments will influence the profitability of network operators. NGNs present an opportunity for the success of service delivery platforms designed for IP multimedia communications, like the IP Multimedia Subsystem (IMS). Moreover, they present a platform for the delivery o...

Billing, charging and accounting are the most critical operational support activities for any telecommunications network operator. Through these activities operators recover costs for service provision, and make business profits. IMS charging is required at the services level as well as the transport level. In networks with QoS guarantees, it is ne...

The advent of IP communications challenged the use of legacy charging methods. Moreover, the diversity of Internet applications complicates the deployment of charging schemes in converged networks. Charging requires the collection of accounting information of resource usage, a process that consumes system resources that are needed for service deliv...

Resource sharing in commercial mobile networks may present operators with options to cut costs and prevent network churn. In resource sharing, when the network expe-riences resource constraints, the operator can negotiate with other reachable networks to outsource the provision of network access serveices. The revenue earned from user payments will...

Policy Based Network Management (PBNM) simplifies the administration and management of communication networks. However due to the wide variety of policy representation forms, interoperability between different entities of PBNM systems becomes a concern. The Common Open Policy Service (COPS), which was standardized for policy control between a Polic...

In a virtual home environment (VHE), mobile users may access all services available on their home network, in the same manner and with the same level of service performance. Interaction between users, their home networks and candidate visited networks should be planned for service discovery, and QoS and price negotiation. A further aspect for consi...

Roaming agreements in 3G and beyond 3G networks can greatly enhance the delivery of services to end users. The cost of service delivery to the user depends on the price charged on networks traversed by user traffic. In a QoS DiffServ environment, network resources may be sold in aggregate blocks at wholesale prices to competing ISPs. This can influ...

Pricing in 3G and other communication networks may control and manage the utilisation of network resources. The available network resources get strained with increased usage levels, which results in poor service to the users. Most users prefer receiving high quality services at affordable costs. This requires the provision of QoS guarantees for net...

The deployment of pricing schemes for communication services is driven by the network technologies. QoS is a major factor that affects the choice of a pricing scheme for a given network. In this paper, we explore a pricing scheme that uses service profiles, which define the QoS received from accessing a common resource pool. Through resource sharin...

The prices used for the charging of data and multimedia services in communication networks depend on the profit maximization goals of the network operators and service providers, and the market forces affecting the industry. In many scenarios the tariff rates used increase with the speed of the access channel. Next generation networks will offer hi...

Third generation networks e.g. the Universal Mobile Telecommunications System (UMTS) provide higher data transfer rates which enables the transport of real-time multimedia traffic e.g. streaming video. The cost of Internet access over mobile networks remains high yet user demand for mobile services is increasing rapidly. In order for mobile computi...

In the pricing of network resources, network operators and service providers aim at facilitating the use of the limited network resources in a manner that would encourage responsibility among the end-users and lead to the maximisation of profits. The optimum tariff rates used for charging the mobile services are affected by factors like the market...