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This paper presents the technology and laboratory testing of an embedded system that enables inter-vehicular communication for real-time route guidance (RG). Specifically, it presents a developed prototype for testbed deployment of the vehicle-to-vehicle-based RG algorithm by Hawas and El-Sayed. For efficient communication and to prevent data overflow, the RG algorithm only allows message exchange among vehicles within the so-called geo-fence regions, which are in the vicinity of the urban network intersections. The utilization of exchanged data among vehicles for real-time navigation and best route finding follows a specific protocol and screening conditions to minimize data overflow and communication requirements. This paper reviews the detailed procedure and the mathematical formulations of the RG algorithm. Detailed functional analysis was performed on the system, and technical requirements were subsequently identified. Based on these requirements, the on-board units were designed, and the functionality was validated with different test cases. To further investigate the performance of the RG algorithm in the real world, different laboratory scenarios were formed to emulate various field conditions. The description of each scenario and the results are discussed in detail.INDEX TERMS Decentralized systems, geo-fence, intelligent transportation systems (ITS), operational and field testing, real-time route guidance, vehicle-to-vehicle communication.

The objective of admission control is to keep the network load moderates as so to achieve a performance objective associated with quality of services. In this paper we briefly review the admission control techniques under queuing theory as a basis for proposing a new selection rule that selects the suitable virtual path for accepting the new request call without regrading the QOS's corresponding to calls already connected on the virtual path under investigation besides to the availability of equivalent capacity for the new request call. Simulation results describes in detail the methodology followed by the different call admission control techniques to accept the new incoming calls according to the different general admission approaches.

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