The current architecture for Connected Vehicle Technology centers on Dedicated Short Range Communications (DSRC), which suffers from several hurdles that limit full realization of the desired goals.  Limited radio vendors and chip set suppliers, combined with slow market growth and minimal deployment leads to expensive equipment with little realization of cost reduction due to economies of scale. Additionally, there is limited incentive for communication service providers to participate jeopardizing long term sustainability. This whitepaper proposes a technology solution that leverages the economies of scale of the cellular ecosystem and incorporates a long range backhaul component missing from DSRC architectures.  The solution is composed of two new disruptive technologies as shown in Figure 1.  The first is the Femtocell, a low cost cellular base station that is near deployment by service providers to address poor cellular connectivity indoors in homes and businesses. Second, a new technology that utilizes unoccupied TV spectrum (whitespace communications) has potential to provide the long range high-bandwidth backhaul component. Pairing Femtocell short-range cellular communications with transportation spectrum and infrastructure creates a budding marketplace for service providers. It has potential to provide a high capacity network for connected vehicles based on low cost cellular technology that can augment DSRC. This can present a powerful incentive for the cellular service providers to underwrite the cost of safety applications.  In exchange for selling additional services to consumers, the approach enables automobile manufacturers to reduce subscriber unit costs, realize recurring income for future upgrades, incorporates connectivity with existing handheld devices, and provides the USDOT with a prospective revenue stream by leasing spectrum to providers. Technical research issues include: 1) assessing the adaption of Femtocell technology to an outdoor vehicle based application (including latency issues); 2) defining the network architecture, identifying requirements for configuring the technology to a 5.9GHz spectrum; 3) investigating the scalability limitations for number of users while maintaining the required quality of service; 4) assessing the security and prioritization needs of Connected Vehicle day one applications; 5) defining the integration architecture between Femtocell and whitespace device backhaul; and 6) identifying limitations and constraints in latency, bandwidth, and security.

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