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dc.contributor.authorHsieh, Yi-Lingen_US
dc.contributor.authorWang, Kuochenen_US
dc.date.accessioned2014-12-08T15:28:10Z-
dc.date.available2014-12-08T15:28:10Z-
dc.date.issued2012-11-14en_US
dc.identifier.issn1389-1286en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.comnet.2012.07.011en_US
dc.identifier.urihttp://hdl.handle.net/11536/20398-
dc.description.abstractInfotainment service has been a foreseeing trend in VANETs (Vehicular Ad Hoc Networks), and multimedia streaming has a high potential in VANET infotainment service. This paper considers the scenario of live multimedia streaming multicast to vehicles of the same group using a dynamic application layer overlay. Due to the willingness for cooperation of non-group nodes, application layer overlay multicast is more feasible than other kinds of multicast such as network-coding-based multicast and network-layer multicast. To adapt to high mobility and full of obstacles in urban VANETs, we propose an effective dynamic overlay multicast scheme for multimedia streaming, called OMV (Overlay Multicast in VANETs). The proposed OMV enhances an overlay's stability with two strategies: (1) QoS-satisfied dynamic overlay and (2) mesh-structure overlay. The QoS-satisfied strategy to adjust the overlay selects potential new parents based on their streams' packet loss rates and end-to-end delays. The mesh-structure strategy allow; a child to have multiple parents. We evaluate the proposed OMV in urban VANETs with obstacles using two real video clips to demonstrate the feasibility of the OMV for real videos. Evaluation results show that comparing the proposed OMV to Qadri et al.'s work, which is a static mesh overlay and is the best method available in VANETs, the packet loss rate is reduced by 27.1% and the end-to-end delay is decreased by 11.7%, with a small control overhead of 2.1%, on average. Comparing the proposed OMV for tree overlays to ALMA, which is for dynamic tree multicast overlays and is also the best method available in MANETs, the packet loss rate is reduced by 7.1% and the end-to-end delay is decreased by 13.1%. In addition, to address the problem of obstacle-prone urban VANETs, we also derive feasible stream rates and overlay sizes for city maps with different road section sizes. To the best of our knowledge, how to organize and dynamically adjust an application layer multicast overlay for live multimedia streaming have not been studied in existing VANET literatures. In summary, to deal with highly dynamic topologies in urban VANETs. we propose a QoS-satisfied strategy for group nodes to switch to new parents that can offer better QoS. The proposed OMV is feasible for live multimedia streaming applications, such as emergency live video transmission and live video tour guides for passengers in different vehicles that belong to the same multicast group. (c) 2012 Elsevier B.V. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectDynamic overlay multicasten_US
dc.subjectMultimedia streamingen_US
dc.subjectQoSen_US
dc.subjectUrban VANETsen_US
dc.titleDynamic overlay multicast for live multimedia streaming in urban VANETsen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.comnet.2012.07.011en_US
dc.identifier.journalCOMPUTER NETWORKSen_US
dc.citation.volume56en_US
dc.citation.issue16en_US
dc.citation.spage3609en_US
dc.citation.epage3628en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.department資訊工程學系zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.contributor.departmentDepartment of Computer Scienceen_US
dc.identifier.wosnumberWOS:000310115200003-
dc.citation.woscount5-
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