近幾年，車載網路 (Vehicle Ad Hoc Network，VANET)的議題受到很多的注意及相關的議題被作討論。一般來說，VANET與傳統上的Ad-Hoc最大的差別是在於VANET中節點的移動速度較快，所以在VANET中傳送資料是具有非常大的挑戰性；因此許多文獻研究都著重在路由協定。這篇論文主要的目的是在城市環境中，讓節點能了解區域中的即時資訊，使得能利用高連通的路徑作資料傳送。在提出的機制中，傳送資料只需了解區域中的拓樸資訊，此使得路由協定在城市環境中有更好的適應性。為此，這篇論文以GPSR (Greedy Perimeter Stateless Routing)的觀念，在選擇下一個節點時不只考慮到路由資料的距離，而且能根據十字路口中的區域環境，加入暫時路邊單元的設計，此路邊單元為等綠燈和地理位置最為靠近十字路口的車輛來暫時充當，藉此改善路由協定之效率。

In recent years, the issue of vehicle network (Vehicle Ad Hoc Network, VANET) are a lot of attention and related issues are discussed.In general, the biggest difference between VANET and the traditional Ad-Hoc is the VANET nodes move faster,so to send a data in VANET is a very big challenge;and many of the literature focuses on the routing protocol.The main purpose of this paper is in an urban environment, so that the node to understand the real-time information in the region,the path can take advantage of the high connectivity for data transfer. In the proposed mechanism to send data only to understand the topology information in the region,this makes the routing protocol in an urban environment have a better adaptability.To this end, this paper GPSR (Greedy Perimeter Stateless Routing) of concepts,select the next node, taking into account not only the distance of the routing information,but also the crossroads of the regional environment, adding to the design of temporary roadside unit,the roadside unit is to temporarily act as a green light and the location most close to the crossroads of the vehicle,thereby improving the efficiency of the routing protocol.

[1] J. Zhu, and S. Roy, \MAC for Dedicated Short Range Communications in
Intelligent Transport System,"in IEEE Communications Magazine, pp. 60-67,
2003
[2] X. C. Chen, \Study of Intelligent Routing Method for Advanced Vehicles in
Safety Intelligent Transportation System," Master's dissertation, National Cen-
tral University Department of Communication Engineering, Taiwan, 2008
[3] F.Li, and Y.Wang, \Routing in Vehicular Ad Hoc Networks: A survey,"in IEEE
Vehicular Technology Magazine, pp. 12-22, 2007
[4] I. Filippini, F. Malandrino, G. Dan, M. Cesana, C. Casetti, and I. Marsh,
\Non-cooperative RSU Deployment in VANETs," Wireless On-Demand Net-
work Systems and Services (WONS), pp.79-88, 2012
[5] B. Jarupan, and E. Ekici, \Location- and Delay-Aware Cross-Layer Communi-
cation in V2I Multihop Vehicular Networks,"in IEEE Communications Maga-
zine, pp. 112-118, 2009
[6] N. Khan, and A. Mahajan, \Centralized Framework with Ring Broadcasting
for Real Time Tra c in Vehicular Ad hoc Networks," Third International Con-
ference on Emerging Trends in Engineering and Technology, pp. 842-847, 2010
[7] A. Mostafa, A. M. Vegni, R. Singoria, T. Oliveira,Thomas D.C. Little, and
D. P. Agrawal, \A V2X-based approach for reduction of delay propagation in
Vehicular Ad-Hoc Networks," Seamless Connectivity in Vehicular Networks, pp.
756-761, 2011
31
[8] A.M. Vegni, and T.D.C. Little, \A Message Propagation Model for Hybrid Ve-
hicular Communication Protocols," Nets4Cars-2, CSNDSP, pp. 382-386, 2010
[9] H. Saleet, R. Langar, K. Naik, R. Boutaba, A. Nayak, and N. Goel,
\Intersection-Based Geographical Routing Protocol for VANETs: A Proposal
and Analysis," IEEE Transactions On Vehicular Technology, vol. 60, no. 9, pp.
4560-4574, 2011
[10] Q. Wang, P. Fan, and K. B. Letaief, \On the Joint V2I and V2V Scheduling for
Cooperative VANETs with Network Coding," IEEE Transactions On Vehicular
Technology, vol. 61, no. 1, pp. 62-73, 2012
[11] C. Campolo, and A. Molinaro, \On Vehicle-to-Roadside Communications in
802.11p WAVE VANETs," IEEE WCNC, pp. 1010-1015, 2011
[12] W. Cho, S. I. Kim, H. k. Choi, H. S. Oh, and D. Y. Kwak, \Performance
Evaluation of V2V/V2I Communications: The E ect of Midamble Insertion,"
Wireless VITAE, pp. 793-797, 2009
[13] P. Salvo, F. Cuomo, and A. Baiocchi, \Road Side Unit coverage extension
for data dissemination in VANETs," 9th Annual Conference on Wireless On-
Demand Network Systems and Services (WONS), pp. 47-50, 2012
[14] M. Belhassen, A. Belghith, and M. A. Abid, \Performance Evaluation of a Car-
tography Enhanced OLSR for Mobile Multi-Hop Ad Hoc Networks," Wireless
Advanced (WiAd), pp.149.155, 2011
[15] D. junxia, \Simulation and Evaluation of the Performance of FSR Routing
Protocols Based on Group Mobility Model in Mobile Ad Hoc," Computational
Intelligence and Software Engineering (CiSE), 2010
[16] E. Spaho, M. Ikeda, L. Barolli, F. Xhafa, A. Biberaj, and J. Iwashige, \Perfor-
mance Comparison of DSDV and DYMO Protocols for Vehicular Ad hoc Net-
works," Advanced Information Networking and Applications (AINA), pp.629-
634, 2012
32
[17] D. K. Sharma, C. Kumar,S. Jain,and Neeraj Tyagi, \An Enhancement of AODV
Routing Protocol for Wireless Ad Hoc Networks," Recent Advances in Infor-
mation Technology, pp. 290-294, 2012
[18] I. Woungang, S. K. Dhurandher, R. D. Peddi, and M. S. Obaidat, \Detect-
ing Blackhole Attacks on DSR-based Mobile Ad Hoc Networks," Computer,
Information and Telecommunication Systems (CITS), 2012
[19] M. GILG, P. LORENZ,and J. RODRIGUES, \Location-aided routing using
image representation for wireless sensor networks," Communications (ICC),
2011
[20] Y. Gui, E. Chan, \Data Scheduling for Multi-item Requests in Vehicle-Roadside
Data Access with Motion Prediction Based Workload Transfer," Advanced In-
formation Networking and Applications Workshops (WAINA), pp.569-574, 2012
[21] C. Campolo, and A. Molinaro, \Improving V2R connectivity to provide ITS
applications in IEEE 802.11pWAVE VANETs," International Conference on
Telecommunications (ICT), pp.476-481, 2011
[22] J. J. CHANG, Y. H. LI, W. J. LIAO, and I. C. CHANG \INTERSECTION-
BASED ROUTING FOR URBAN VEHICULAR COMMUNICATIONS WITH
TRAFFIC-LIGHT CONSIDERATIONS," IEEE Wireless Communications,
pp.82-88, 2012
[23] B. Aslam, and C. C. Zou , \Optimal Roadside Units Placement along High-
ways," IEEE Consumer Communications and Networking Conference, pp.814-
815, 2011
[24] Y. B. Wang, T. Y. Wu, W. T. Lee, and C. H. Ke., \A Novel Geographic Rout-
ing Strategy over VANET," IEEE 24th International Conference on Advanced
Information Networking and Applications Workshops, pp. 873-879, 2010
[25] A. Dahiya, Madhu, and N. Bansal, \PATH DISCOVERY IN VEHICULAR AD
HOC NETWORKS," Second International Conference on Advanced Computing
and Communication Technologies, pp. 551-555, 2012
33
[26] S. L. Tsao, and C. M. Cheng, \Design and Evaluation of a Two-Tier Peer-
to-Peer Tra c Information System," IEEE Communications Magazine, PP.
165-172, 2011
[27] Alan D. Amis, R. Prakash, Thai H.P. Vuong,and Dung T. Huynh \Max-Min D-
Cluster Formation in Wireless Ad Hoc Networks," INFOCOM 2000. Nineteenth
Annual Joint Conference of the IEEE Computer and Communications Societies,
pp. 32-41,vol. 1, 2000
[28] Y. Li, K. Ying, P. Cheng, H. Yu and H. Luo \Cooperative Data Dissemination
in Cellular-VANET Heterogeneous Wireless Networks," High Speed Intelligent
Communication Forum (HSIC), pp. 12-22, 2012
[29] A. K. Bisht, B. Kumar, and S. Mishra, \E ciency Evaluation of Routing Proto-
cols for Vehicular Ad-Hoc Networks Using City Scenario," International Con-
ference on Computer Communication and Informatics, Coimbatore, INDIA,
2012
[30] \The Network Simulator - ns-2." from http://www.isi.edu/nsnam/ns/.
[31] \SUMO Simulation of Urban Mobility." from http://sumo.sourceforge.net/.