SOTIS - a self-organizing traffic information system

Wischoff, L.; Ebner, André; Rohling, Hermann; Lott, M.; Halfmann, R.

doi:10.1109/vetecs.2003.1208829

Cited by 185 publications

(115 citation statements)

References 3 publications

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“…One of the first solutions for distributed traffic congestion detection is SOTIS [6], where each vehicle monitors the traffic situation by analyzing the received information from other vehicles about their location, speed, direction, etc. It is simulated only in highway scenario, and it assumed periodic broadcasting of messages.…”

Section: Imentioning

confidence: 99%

Short paper: Distributed vehicular traffic congestion detection algorithm for urban environments

Milojevic

Rakocevic

2013

2013 IEEE Vehicular Networking Conference

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Abstract-Vehicular traffic congestion is a well-known economic and social problem generating significant costs and safety challenges, and increasing pollution in the cities. Current intelligent transport systems and vehicular networking technologies rely heavily on the supporting network infrastructure which is still not widely available. This paper contributes towards the development of distributed and cooperative vehicular traffic congestion detection by proposing a new vehicle-to-vehicle (V2V) congestion detection algorithm based on the IEEE 802.11p standard. The new algorithm allows vehicles to be self-aware of the traffic in the street, performing congestion detection based on speed monitoring and cooperation with the surrounding vehicles. Cooperation is achieved using adaptive single-hop broadcasting which depends on the level of congestion. The paper presents the congestion detection algorithm and the cooperative communication in detail, and presents performance evaluation using large-scale simulation in Veins framework based on OMNeT++ network simulator and SUMO vehicular mobility simulator. Results show that precise congestion detection and quantification can be achieved using a significantly decreased number of exchanged packets.

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Section: Imentioning

confidence: 99%

Short paper: Distributed vehicular traffic congestion detection algorithm for urban environments

Milojevic

Rakocevic

2013

2013 IEEE Vehicular Networking Conference

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“…The information can be utilized to help drivers judge whether the road they are approaching is congested. Wischhof et al propose SOTIS [13] within the FleetNet [14] project. In SOTIS, vehicles monitor and analyze data individually using the periodically exchanged traffic data by themselves.…”

Section: Related Workmentioning

confidence: 99%

Directed information dissemination in vehicular ad-hoc networks

2013

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In this article, we utilize the idea of multipoint relays (MPRs) found in literature [2] to propagate accident information in a restricted way (e.g., only backwards). We devise an algorithm to identify MPRs that are geographically situated behind a particular node using only its neighbor table, and speed information of the neighboring vehicles. With the identification of the backward MPRs, it is possible to restrict the information dissemination to vehicles behind a particular Vehicular Ad-hoc Network (VANET) node only.This might benefit the approaching vehicles so that the driver could take preventive measures in real-time since he/she will have an indication of the severity of road conditions ahead. We assume that there exists an inter vehicular network using Optimized Link State Routing (OLSR) where accident information can be propagated to all nodes using on-going OLSR control packets. We envision our application will run on top of existing routing protocols (e.g., OLSR), thereby resulting in very little integration effort, and retaining OLSR's reduced network traffic advantage through the use of MPRs. We analyze our back MPR identification algorithm in a detailed manner. We also show that by using our approach the location of the accident alert instigator node could be pinpointed if a subset of the nodes in the same VANET know their geographical positions. We use VANET mobility models generated by SUMO into NS-3 for our simulations, and also perform preliminary experiments to verify the algorithm's effectiveness. Our analysis and experiments show favorable results.

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“…SOTIS [7] and TrafficView [8] exchange information like speed and position among vehicles in order to enable users to access the current traffic conditions. Another decentralized approach to find free parking places is presented in [9].…”

Section: Related Workmentioning

confidence: 99%

Beacon-based short message exchange in an inner city environment

Schnaufer

Kopf

Lemelson

et al. 2010

2010 the 9th IFIP Annual Mediterranean Ad Hoc Networking Workshop (Med-Hoc-Net)

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Abstract-In this paper, we proposes a method to utilize the huge number of IEEE 802.11 access points in an inner city environment to distribute information such as local sensor values, votes or short text messages. Due to the overlapping channels on IEEE 802.11b/g it is possible to receive packets from neighboring channels by overhearing. This fact allows every access point to monitor a part of the frequency band without switching the current radio channel. Our novel idea is to add user data to network layer beacon packets which every access point continuously send on a user-selected radio channel. This method allows transferring small size messages between access points or an access point and a mobile device without any reconfiguration like disabling the WLAN encryption.We conduct a measurement in the inner city of Mannheim, Germany to evaluate the typical density and distribution of access points in such an environment. We then use the measured data to calculate for every access point the expected reception probability on the street segments around. Based on these statistics, we appraise the reception probabilities of the access points among each other and perform a simulation study to estimate the size of the dissemination area that can be reached. Additionally, we analyze the required time to distribute the information to all reachable access points. Based on the measurement and simulation results, we can conclude that the estimated connectivity of an ad-hoc network based on access points is sufficient to disseminate information in the proximity.

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SOTIS - a self-organizing traffic information system

Cited by 185 publications

References 3 publications

Short paper: Distributed vehicular traffic congestion detection algorithm for urban environments

Short paper: Distributed vehicular traffic congestion detection algorithm for urban environments

Directed information dissemination in vehicular ad-hoc networks

Beacon-based short message exchange in an inner city environment

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