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alizadeh2021wireless


Elnaz Alizadeh Jarchlo, "Wireless Handover Solutions in Vehicular Visible Light Communications," PhD Thesis, School of Electrical Engineering and Computer Science, TU Berlin (TUB), August 2021. (Advisor: Falko Dressler; Referees: Falko Dressler, Giuseppe Caire and Mohammad Ali Khalighi)


Abstract

A vast number of research works demonstrated the high potential of Visible Light Communications (VLC) as a complementary wireless communication technology that can be widely used in vehicular VLC (V-VLC) networks. V-VLC utilizes visible light spectrum in order to provide communication connections among vehicles. To guarantee coverage in V-VLC networks many Access Points (AP) can be used, which can result in intermittent connectivity between vehicles as the clients and their as- sociated AP and lead to many handovers. In VLC-based vehicular communications the link may experience regular link failures due to shadowing, obstacle, and mobility in contrast to RF-based networks. Therefore, one of the main challenges of V-VLC is the frequent handover which causes outages and network disruption, evidently. This Ph.D. thesis aims enhancing the reliability and robustness of the indoor vehicular network communications by reducing the handover latency in the vehicular network. In this thesis, I propose handover solutions at different network layers using different wireless technologies. Note, in all proposed solutions, VLC acts as a primary connection link. To address the frequent link failures during handover in the V-VLC network, I propose Flexible Light Communications (Flight) and Frequency Diversity and Link Aggregation (FDLA) architectures which make use of link aggregation method and Frequency Division Multiple Access (FDMA) in data link layer to switch between available Light Access points (LAP) in case of handover during mobility or the link blockage in linear and two dimensional (2D) movements, respectively. Applying Flight and FDLA solutions decrease the handover delay from 15 s to 0.3, and 0.2 s, respectively compared with no handover technique. Moreover, in the transport layer I utilize the advantage of Multipath-Transmission Control Protocol (MPTCP) to provide network redundancy and load balancing during handover and minimize the number of packet lost caused by connection lose. This solution minimizes the handover delay up to 0.02 s. Additionally, in order to add robustness and increase network reliability and coverage, I propose Li-Wi, a system which utilizes the ben- efits of high data rates and link availability of VLC and Wireless Fidelity (WiFi), respectively. Li-Wi solution minimizes the handover latency significantly up to 0.03 s. In this thesis I introduce V-VLC network scenarios, where there are Automated Guided Vehicles (AGV) moving linearly and in 2D around the warehouse in an indoor environment and each AGV is equipped with several Light Clients (LC). The installed LC stablish VLC link connections with their corresponding LAP which are installed on ceiling. Each pair of LC and LAP is assigned to non-overlapped frequency bands using FDMA technique. Therefore, each LC can establish a VLC link with its corresponding LAP. The main contributions of this thesis can be summarized as (i) Developed several upper layer handover solutions for indoor V-VLC networks, (ii) Assessed the effect of link aggregation and MPTCP methods in the data link and transport layers, respectively separately and together as a combined architecture in a hybrid vehicular network where VLC and WiFi act as a primary and backup links, respectively, and (iii) Demonstrated how applying proposed solutions decrease network latency in both horizontal and vertical handovers in a V-VLC network, which lead to provide an improved network in terms of coverage, reliability and robustness.

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Elnaz Alizadeh Jarchlo

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@phdthesis{alizadeh2021wireless,
    author = {Alizadeh Jarchlo, Elnaz},
    title = {{Wireless Handover Solutions in Vehicular Visible Light Communications}},
    advisor = {Dressler, Falko},
    institution = {School of Electrical Engineering and Computer Science},
    location = {Berlin, Germany},
    month = {8},
    referee = {Dressler, Falko and Caire, Giuseppe and Khalighi, Mohammad Ali},
    school = {TU Berlin (TUB)},
    type = {PhD Thesis},
    year = {2021},
   }
   
   

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