Hybrid Schemes for Social-based Heterogeneous Information Dissemination Through Peer-to-Peer Interactions in Opportunistic Networks

Abdalla Hassan, Gharib (2021) Hybrid Schemes for Social-based Heterogeneous Information Dissemination Through Peer-to-Peer Interactions in Opportunistic Networks. PhD thesis, Universiti Malaysia Sarawak (UNIMAS).

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Abstract

The proliferation and popularity of Portable Hand-held Wireless Devices (PHWDs) as well as the desire of mobile heterogeneous information dissemination on-the-go without being constrained by paid cellular network, wired or wireless network links could be realized by taking advantage of the unused communication opportunities between PHWDs short-range radios, such as Bluetooth and direct-Wi-Fi when users are in communication range. This characterizes Opportunistic Networks (OPPNets), which are distributed self-organizing and dynamic networks formed by PHWDs without communication infrastructure where end-to-end path may not exist most of the time. However, one of the vital challenges faced by these networks is devising efficient routing protocols in terms of increasing delivery ratio with lower overheads in an unstable and intermittent connectivity network environment. Selecting appropriate relays is a crucial phase to attain effective heterogenous information dissemination in OPPNets. Hence, this study is devoted to enhancing heterogenous information dissemination performance by harnessing hybrid multiple-criteria relay selection strategies. The study is split into four main phases governed by established objectives. In the first phase, an extensively reviewed literature of OPPNets including concepts, applications, routing and taxonomies is presented. In the second phase, Encounter-based Opportunistic Relay Selection (Enc-ORS) and Delegated Spray and Wait (D-SnW) scheme are proposed and investigated. Further in third phase, to overcome the information homogeneity limitation, Content-based Opportunistic Relay Selection (Cont-ORS) strategy is formulated that led to the design of Content-Based Spray and Wait (CB-SnW) scheme which performed better than existing and previously proposed strategies. In the final phase, Hybrid Opportunistic Relay Selection (Hybrid-ORS) strategy is devised based on combination of mobility behaviour, content awareness and social awareness, which is then exploited to propose novel Social-based Interest-oriented Heterogeneous Information Dissemination (SIHID) scheme. SIHID outperformed benchmark existing schemes by achieving over 98% delivery probability, reducing overhead cost and latency by 47 and 5 times respectively. Furthermore, the community-focused counterpart of SIHID called SIHIDComm is proposed to consider small group interactions. It outperformed existing community-based schemes in terms of delivery ratio, overhead cost, latency, hop count and buffer occupancy. All the proposed schemes are investigated using scenarios modelled and simulated in Opportunistic Network Environment (ONE) simulator with synthetic traces. This study lays a foundational step towards designing smart high-efficient routing schemes by enabling PHWDs to be aware of different selection criteria to smartly select the best potential relay during opportunistic encounter especially in smart urban city. The scheme can potentially be used by cellular networks to select potential relays during cellular offloading to amplify resource usage and coverages.

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