Experimental Results of Future Road-to-Vehicle Communications System with Handover Function


IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E87-A   No.10   pp.2649-2656
Publication Date: 2004/10/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Wide Band Systems)
DSRC,  handover,  ITS,  handover processing delay,  

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This paper presents experimental results of a future road-to-vehicle communications system with handover function. The proposed handover scheme, based on the current Dedicated Short Range Communication System (DSRC) standard (ARIB STD-T75) in Japan, maintains the continuity of data transmissions over multiple radio zones by transferring received and remaining data between base stations located along the roadside. Moreover, a link connection/disconnection method is newly proposed to avoid repetition of link connection and disconnections around the cell entrance and to actualize smooth handover between cells. The proposed method determines the link connection and disconnection timing by measuring the received signal strength and observing the results of CRC (Cyclic Redundancy Code) error checks of the control channel. By applying the proposed method to mobile stations (MS) in the DSRC system, the communication link between the MS and the base station (BS) can be smoothly connected. Field experiments were conducted to evaluate the performance and validity of the proposed methods using actual equipment. Experimental results show that the proposed methods perform a smooth link connection between cells and achieve a very short handover processing delay of less than 42 milliseconds.