  While the adoption of connected vehicles is growing, security and privacy
concerns are still the key barriers raised by society. These concerns mandate
automakers and standardization groups to propose convenient solutions for
privacy preservation. One of the main proposed solutions is the use of
Pseudonym-Changing Strategies (PCSs). However, ETSI has recently published a
technical report which highlights the absence of standardized and efficient
PCSs [1]. This alarming situation mandates an innovative shift in the way that
the privacy of end-users is protected during their journey. Software-Defined
Networking (SDN) is emerging as a key 5G enabler to manage the network in a
dynamic manner. SDN-enabled wireless networks are opening up new programmable
and highly-flexible privacy-aware solutions. We exploit this paradigm to
propose an innovative software-defined location privacy architecture for
vehicular networks. The proposed architecture is context-aware, programmable,
extensible, and able to encompass all existing and future pseudonym-changing
strategies. To demonstrate the merit of our architecture, we consider a case
study that involves four pseudonym-changing strategies, which we deploy over
our architecture and compare with their static implementations. We also detail
how the SDN controller dynamically switches between the strategies according to
the context.
