Characterizing content sharing properties for mobile users in open city squares

Abstract

Abstract-For mobile delay-tolerant networks, different mobility models have been utilized to assess the performance of routing algorithms and applications. Substantial work has gone into understanding the contact characteristics of mobile users to allow evaluation under conditions that approximate the real world. One important finding has been recognizing that contacts humans make at a macroscopic level is derived from daily routines and social interactions so that analyzing social network structures can assist in determining, e.g., suitable peers for message forwarding. While mid-to long-term social interaction patterns assist in delivering messages at larger scales, such patterns become immaterial when considering a microscopic scale such as content sharing in a city square. At microscopic scales, we face an "open" simulation area in which nodes enter and leave rather than a closed system with a fixed set of nodes. Moreover, small scales show more dynamics (e.g., in terms of node density) and steady state analyses become insufficient.In this paper, we investigate the operation of a content sharing application, Floating Content, under such microscopic mobility conditions and characterize its behavior for city squares. For its validation, we derive a mobility model for open squares to which mobile nodes enter and from which they depart.

Evaluating (Geo) content sharing with the ONE simulator

“…This property is mainly due to the "openness" of the area, which allows nodes to freely enter and depart the system rather than having a fixed set of nodes confined in a closed system. A mobility model that captures this property of openness, the Square Mobility Model, is introduced in [3].…”

Analytical models of floating content in a vehicular urban environment

“…[6] introduces the criticality condition, a sufficient condition for the content to float indefinitely with very high probability, under various mobility models. [8] introduces an analytical model to estimate content persistence in the case of outdoor pedestrian mobility over large open spaces, such as a city square.…”

DeepFloat: Resource-Efficient Dynamic Management of Vehicular Floating Content

“…On one side, many works focus on content persistence over time and propose heuristics for guaranteeing content persistence within a predefined region, which usually coincides with the AZ itself [3]. Such heuristics are often tailored to a specific context (e.g., highways or pedestrians in city squares [12]), and assume that a high likelihood of content persistence is sufficient to successfully support applications such as notifications of car accidents or traffic congestion. But they are hard to generalize for other applications that need a minimum amount of delivered contents within a given area.…”