Enhanced SDMA for VANET Communication

VANETs aim to improve traffic safety and driving experience on the road. A medium access protocol for VANETs determines their performance. A key challenge in the design of MAC protocol is timely and accurate delivery of messages even when network topology changes quickly. In this work, we propose enhancements in the native SDMA protocol to suit safety critical message transfer in VANETs. In the proposed enhanced SDMA, the road is logically divided into spatial slots and TDMA time slots are assigned to each spatial location. In Enhanced SDMA, the spatial slot allocation is done using the vehicular traffic distribution. The empty slots in sparse traffic and paucity of slots in congested traffic are allocated to optimize the fairness in channel distribution and throughput maximization using SINR (Signal to Noise and Interference Ratio). Simulation results indicate the Enhanced SDMA is able to achieve both efficient slot allocation and enhanced throughput for both free flow and congested traffic states.

[1]  Shekhar Verma,et al.  CMAC: A cluster based MAC protocol for VANETs , 2010, 2010 International Conference on Computer Information Systems and Industrial Management Applications (CISIM).

[2]  Abhay Karandikar,et al.  Link Scheduling Algorithms for Wireless Mesh Networks , 2011, IEEE Communications Surveys & Tutorials.

[3]  Jun Peng,et al.  A Distributed MAC Scheme for Emergency Message Dissemination in Vehicular Ad Hoc Networks , 2007, IEEE Transactions on Vehicular Technology.

[4]  Antonio Capone,et al.  RR-ALOHA, a Reliable R-ALOHA broadcast channel for ad-hoc inter-vehicle communication networks , 2002 .

[5]  Torgeir Vaa,et al.  Intelligent transport systems and effects on road traffic accidents: State of the art , 2007 .

[6]  Eylem Ekici,et al.  Location- and delay-aware cross-layer communication in V2I multihop vehicular networks , 2009, IEEE Communications Magazine.

[7]  F. Borgonovo,et al.  ADHOC: a new, flexible and reliable MAC architecture for ad-hoc networks , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[8]  Luciano Bononi,et al.  A Cross Layered MAC and Clustering Scheme for Efficient Broadcast in VANETs , 2007, 2007 IEEE Internatonal Conference on Mobile Adhoc and Sensor Systems.

[9]  Xianbo Chen,et al.  SDMA: On The Suitability for VANET , 2008, 2008 3rd International Conference on Information and Communication Technologies: From Theory to Applications.

[10]  Jingwu Cui,et al.  Cross-layer design for scheduling in cooperative VANETs , 2009, 2009 9th International Conference on Intelligent Transport Systems Telecommunications, (ITST).

[11]  Azim Eskandarian,et al.  A Reliable Link-Layer Protocol for Robust and Scalable Intervehicle Communications , 2007, IEEE Transactions on Intelligent Transportation Systems.

[12]  Shekhar Verma,et al.  RSU centric channel allocation in Vehicular Ad-hoc Networks , 2010, 2010 Sixth International conference on Wireless Communication and Sensor Networks.