No Link Left Behind

Sebastian Sonntag

    Research output: ThesisDoctoral ThesisCollection of Articles


    Mobile Internet access has become a critical part of our society. Practically every person in Western countries has a smart phone. These devices are used from browsing the Internet to business transactions, various streaming services, and even emergency information. As a consequence, mobile data traffic is quickly catching up with wired traffic. People, especially in rural areas, are replacing their wired connections with mobile broadband. One of the most recent evolutions are multisim devices that allow simultaneous access to multiple mobile networks and thereby enhance the quality of the mobile connection. However, there is no established protocol for utilizing this type of multipath access. Multipath transport is a transport-level solution that makes it possible for end hosts to use multiple access networks simultaneously. This dissertation analyzes the feasibility of using multipath transport in mobile networks. Prior studies suggest that a protocol for multipath transport requires user need, that the protocol is superior to existing solutions, and that the network has capacity. This dissertation shows use cases and demand, analyzes achievable performance, and verifies that mobile networks have the capacity and diversity for multipath communication. Finally, the dissertation quantifies the benefits of using multipath transport. There are two categories of mobile devices that allow access to multiple networks: active and passive multisim devices. Multipath transport can aggregate very efficiently all capacity available to active multisim device. In contrast, passive multisim devices make use of a host multihoming protocol for sequential access to mobile networks. The results show that mobile networks are diverse enough to improve availability, throughput and failure tolerance. Thus, multipath transport enables mobile devices to maintain an acceptable level of service in both time and space.
    Translated title of the contributionLinkkiäkään ei jätetä
    Original languageEnglish
    QualificationDoctor's degree
    Awarding Institution
    • Aalto University
    • Manner, Jukka, Supervising Professor
    • Manner, Jukka, Thesis Advisor
    Print ISBNs978-952-60-6651-6
    Electronic ISBNs978-952-60-6652-3
    Publication statusPublished - 2016
    MoE publication typeG5 Doctoral dissertation (article)


    • multipath protocols
    • host multihoming
    • mobile networks
    • measurements


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