Ghasemi Najm, Mahnaz (2020) Using ANDSF For Convergence Access Network Selection and Service Adaptation Based on Context. Masters thesis, University of Huddersfield.

Changing contexts and requirements of mobile users necessitates a constant creative drive on the part of service providers and other experts involved to supply, improve and uphold their services. Maintaining both availability and high quality connection to desired networks are amongst the essential concerns of heterogeneous networks which are also based on considering user criteria. In this direction, a comprehensive model for access network selection and service awareness using Access Network Discovery and Selection Function (ANDSF) is proposed. The model in the present study aims to decrease the processing delay and the number of vertical handovers using the Simple additive weighting (SAW) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) algorithms in decision making part. The technical characteristics and performance of the access networks such as reliability, coverage and congestion are expressed as network context in terms of providing certain level of Key performance indicators (KPIs). The network profile is designed in a way which satisfy the User profile requirement (for example network bandwidth as a network profile should cover the required QoS as the User profile convince the UP criteria). Service level context which is transferred over session description protocol (SDP) plays a vital role in order to ensure the QoS level provisioning for end users. The ANDSF entity includes the client and server in which ANDSF server acts as the brain of the proposed architecture. They keep the user, network and service profile up ad working. Also, ANDSF acts as a first filter to apply the operator policies. This results in a decision making process based on the inputs of service, network and user context collected from different elements of the core networks. The findings show how the optimised access network selection can provides the user with acceptable Quality of Experience (QoE) level.

ANDSF-related research dealing with context-aware handover issues in the research literature have generally focused on the decision part without making it clear where these contexts come from. However, in the current project, the interfaces were explained in detail and the assumptions are expressed and the origins of contexts were made clear. In this dissertation the ability for the user or other mobile entities to communicate with the service provider is discussed. As the second subject, the possibility of service provider's profile adaptation with network context changes which is affected by the network selection mechanism was also discussed.

FINAL THESIS - Ghaseminajm.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

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