Remote service discovery and control for ubiquitous service environments in next-generation networks

Doktorgradsavhandling i informasjons- og kommunikasjonsteknologi, Universitetet i Agder, Grimstad, 201

Remote service discovery and control for ubiquitous service environments in next-generation networks

Doktorgradsavhandling i informasjons- og kommunikasjonsteknologi, Universitetet i Agder, Grimstad, 201

Remote service usage through SIP with multimedia access as a use case

The IP Multimedia Subsystem is under deployment, as an IP-based service control and access infrastructure, but how it interconnects with residential appliances is currently unclear. With IMS access for the residential appliances they can be used as both service consumers and service providers. In this paper we present a protocol which allows residential services to be remotely invoked, through the IMS, and consumed in a different network, along with a prototype implementation and early results. With our protocol services of two distinct service protocol systems can cooperate

“Sven and the Media Portal” : A Nomadic Use Case for the Extended Home

The Networked and Electronic Media Technology Platform (NEM) [5] states that users will consume an “innovative mix of various media forms, delivered seamlessly over technologically transparent networks, to improve the quality, enjoyment and value of life. [6] visualizes a future use case and some of the challenges that need to be addressed before the NEM vision becomes reality

UPnP control point for mobile phones in residential networks

Together, Ericsson and HiA are studying the role of WiFi-enabled mobile phones in residential networks. This article describes a first step to allow mobile phones to discover and control networked residential media servers and renderers following the standards developed by the UPnP Forum

Evaluation of frameworks for creating end-to-end mobile services with OMA MMS as a use case

Masteroppgave i informasjons- og kommunikasjonsteknologi 2005 - Høgskolen i Agder, GrimstadSeveral frameworks are available in 3GPP networks to create mobile services, such as the Open Service Access (OSA) Application Programming Interface (API) and the native Session Initiation Protocol (SIP). Each of these frameworks has their own advantages and disadvantages. Therefore it is important for a service to use a framework which suits its own requirements as best as possible. In this thesis we have defined a use case, TMMS Service. This use case has been designed for four frameworks selected, which are: GPRS, IMS, OSA API and OSA Parlay X Web Services. We have then evaluated the design of these services against a set of evaluation criteria. The evaluation criteria cover security, usability, modifiability, reliability, interoperability and billability. Our evaluation has proved that none of the frameworks are superior in all areas. The best framework overall is IMS which provides a lot of end-to-end features and is also very extensible. One of the biggest disadvantages with IMS is the current lack of a specific set of documentation for application developers

Using SIP Presence for Remote Service Awareness

Residential networks usually protect its devices and services behind firewalls and use private IP addresses. Therefore, appliances within a residential network cannot be discovered and utilized from external networks by standardized technologies as UPnP. In this paper, we present our concept of “Service Presence”, based on the 3GPP Presence Service that makes the service presence information remotely discoverable

Numerical Study of Quenching Distances for Side-Wall Quenching Using Detailed Diffusion and Chemistry

The numerical investigation of quenching distances in laminar flows is mainly concerned with two setups: head-on quenching (HOQ) and side-wall quenching (SWQ). While most of the numerical work has been conducted for HOQ with good agreement between simulation and experiment, far less analysis has been done for SWQ. Most of the SWQ simulations used simplified diffusion models or reduced chemistry and achieved reasonable agreement with experiments. However, it has been found that quenching distances for the SWQ setup differ from experimental results if detailed diffusion models and chemical reaction mechanisms are employed. Side-wall quenching is investigated numerically in this work with steady-state 2D and 3D simulations of an experimental flame setup. The simulations fully resolve the flame and employ detailed reaction mechanisms as well as molecular diffusion models. The goal is to provide data for the sensitivity of numerical quenching distances to different parameters. Quenching distances are determined based on different markers: chemiluminescent species, temperature and OH iso-surface. The quenching distances and heat fluxes at the cold wall from simulations and measurements agree well qualitatively. However, quenching distances from the simulations are lower than those from the experiments by a constant factor, which is the same for both methane and propane flames and also for a wide range of equivalence ratios and different markers. A systematic study of different influencing factors is performed: Changing the reaction mechanism in the simulation has little impact on the quenching distance, which has been tested with over 20 different reaction mechanisms. Detailed diffusion models like the mixture-averaged diffusion model and multi-component diffusion model with and without Soret effect yield the same quenching distances. By assuming a unity Lewis number, however, quenching distances increase significantly and have better agreement with measurements. This was validated by two different numerical codes (OpenFOAM and FASTEST) and also by 1D head-on quenching simulations (HOQ). Superimposing a fluctuation on the inlet velocity in the simulation also increases the quenching distance on average compared to the reference steady-state case. The inlet velocity profile, temperature boundary condition of the rod and radiation have a negligible effect. Finally, three dimensional simulations are necessary in order to obtain the correct velocity field in the SWQ computations. This however has only a negligible effect on quenching distances

Evaluation of frameworks for creating end-to-end mobile services with OMA MMS as a use case

Several frameworks are available in 3GPP networks to create mobile services, such as the Open Service Access (OSA) Application Programming Interface (API) and the native Session Initiation Protocol (SIP). Each of these frameworks has their own advantages and disadvantages. Therefore it is important for a service to use a framework which suits its own requirements as best as possible. In this thesis we have defined a use case, TMMS Service. This use case has been designed for four frameworks selected, which are: GPRS, IMS, OSA API and OSA Parlay X Web Services. We have then evaluated the design of these services against a set of evaluation criteria. The evaluation criteria cover security, usability, modifiability, reliability, interoperability and billability. Our evaluation has proved that none of the frameworks are superior in all areas. The best framework overall is IMS which provides a lot of end-to-end features and is also very extensible. One of the biggest disadvantages with IMS is the current lack of a specific set of documentation for application developers