Congestion-controlled-coordinator-based mac for safety-critical message transmission in VANETs

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Title:	Congestion-controlled-coordinator-based mac for safety-critical message transmission in VANETs
Authors:	吳曉光;Sahoo, Jagruti;Wu, Eric Hsiao-Kuang;Sahu, Pratap Kumar;Gerla, Mario
Contributors:	資訊電機學院資訊工程學系
Keywords:	Beacon;dedicated short-range communications (DSRC);Delays;emergency message;IEEE 802.11p;Interference;Media Access Protocol;Safety;Vehicles;vehicular ad hoc network (VANET);Vehicular ad hoc networks
Date:	2013-06-25
Issue Date:	2026-04-23 13:25:40 (UTC+8)
Publisher:	Institute of Electrical and Electronics Engineers Inc.;IEEE
Abstract:	摘要： Vehicular ad hoc networks (VANETs) provide the communication framework for the dissemination of safety-critical messages such as beacons and emergency messages. The communication channel witnesses significant network load generated by frequently exchanged beacons. Under high-density situations, it leads to a serious scalability problem in VANETs. Moreover, contention-based medium access control (MAC) protocols suffer from a great number of packet collisions, and as a result, the reliability and latency of safety messages are severely affected. Because of the periodic nature of beacons, time-division multiple access (TDMA) can be a good choice over contention-based MAC. In this paper, we propose congestion-controlled-coordinator-based MAC (CCC-MAC), which is a time-slot-based medium access protocol that addresses beacons and emergency messages. Basically, the network is virtually partitioned into a number of segments. Within a segment, medium access is accomplished by using a time-slot-scheduling mechanism supervised by a local coordinator vehicle. A significant number of vehicles can be supported under the proposed configuration. In fact, the proposed scheduling mitigates channel congestion by reducing the transmission time of beacons through the use of multiple data rates. Bandwidth utilization is also improved by reusing the unoccupied time slots. Finally, CCC-MAC ensures fast and reliable propagation of emergency messages by employing a pulse-based reservation mechanism. In the simulations, we demonstrate the ability of CCC-MAC to scale well in different vehicular density scenarios. Moreover, it outperforms existing MAC-layer protocols with respect to packet reception probability and latency of safety messages. 其他題名： TITS 出版者： IEEE 出版日期： 2013-09-01 出處： IEEE transactions on intelligent transportation systems, 2013-09, Vol.14 (3), p.1423-1437 資源來源： IEEE Electronic Library (IEL) 識別號： ISSN: 1524-9050 識別號： EISSN: 1558-0016 識別號： DOI: 10.1109/TITS.2013.2264320 識別號： CODEN: ITISFG
Appears in Collections:	[Department of Computer Science and information Engineering] journal & Dissertation

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