On the transition to the mobile internet
- Autores: Albert Cabellos Aparicio
- Directores de la Tesis: Jordi Domingo i Pascual (dir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2008
- Idioma: español
- Tribunal Calificador de la Tesis: Josep Solé Pareta (presid.), Carmen Guerrero López (secret.), Giorgio Ventre (voc.), Fernando Pedro Lopes Boavida (voc.), Fabio Ricciato (voc.)
- Materias:
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- Resumen
The Internet is an evolving system. Recently wireless technologies have opened up the possibility of deploying mobility at the Internet. With mobility end hosts can change its point of attachment while maintaining its network connections.
Deploying such functionality at the current Internet architecture is a complex task. This thesis analyzes such issue using a technical and a cost-effective point of view. Our analysis suggests that although technically the optimal solution would be a cross-layer deployment, network-layer mobility provides the most cost-effective solution. The proposed network-layer mobility protocol, defined by the IETF, is the Mobile IP technology. Taking this into consideration this thesis analyzes the transition to the Mobile Internet considering the deployment of this family of protocols. Specifically the main objectives of this thesis are to analyze the transition to the Mobile Internet, identify its potential issues and propose solutions.
The analysis is carried out at three different stages of the transition. First at present, by analyzing the Mobile IP technology. Our study shows that one of the key issues of Mobile IP is the performance of the handover. The thesis presents an analytical model and experimentation to study several metrics related with the performance of the handover of the main protocols of Mobile IP. Our results show that while Mobile IPv4 and Fast Handovers for Mobile IPv6 can support real-time applications, Mobile IPv6's not.
The second stage of the analysis is in the near-future, during the deployment phase of Mobile IP. As shown in this part of the thesis, the main issue during this phase of the transition is the lack of route optimization. This prevents mobile clients from communicating directly with its peers, and this has a significant impact on the performance of such networks. In order to solve this we propose the fP2P-HN architecture. A P2P-based network of distributed Home Agents that reduces significantly the delays of the paths of mobile clients. Our evaluation shows that our proposal is scalable (O(1)) and can improve significantly such networks. Finally the third stage of our analysis is in the future, were the Internet is Mobile IP-enabled and new architectures can improve its functionalities. Particularly this thesis analyzes the advantages and the complexity of terminals equipped with multiple interfaces. These terminals can provide more aggregate bandwidth, increase the reliability and the area of coverage. However supporting multiple interfaces can be a complex task. Our analysis reveals that a generic architecture able to deal with these issues can be greatly enhanced if the available bandwidth of the different paths provided by the multiple interfaces can be estimated. Research on bandwidth estimation has focused mainly on periodic probing processes and wired networks, however very little research has been conducted considering wireless links (a typical scenario of mobility).
Therefore this thesis focuses on analyzing the existing methodologies and tools in the presence of wireless links, taking the IEEE 802.11 standard as a reference.
Our study shows that periodic probing processes target the achievable throughput instead of the available bandwidth and that such measurements are biased. Taking this into consideration this thesis explores Poisson-probing process to estimate the available bandwidth in wireless and wired scenarios. In particular our research has lead us to design three different tools that can operate in a wide range of scenarios. Furthermore, our study in Poisson probing processes reveals that they are useful to estimate the available bandwidth in wireless links and can produce lighter (less intrusive) and faster tools.
