  The idea of having the geolocation database monitor the secondary use of TV
white space (TVWS) spectrum and assist in coordinating the secondary usage is
gaining ground. Considering the home networking use case, we leverage the
geolocation database for interference-aware coordinated TVWS sharing among
secondary users (home networks) using {\em short-term auctions}, thereby
realize a dynamic secondary market. To enable this auctioning based coordinated
TVWS sharing framework, we propose an enhanced {\em market-driven TVWS spectrum
access model}. For the short-term auctions, we propose an online multi-unit,
iterative truthful mechanism called VERUM that takes into consideration
spatially heterogeneous spectrum availability, an inherent characteristic in
the TVWS context. We prove that VERUM is truthful (i.e., the best strategy for
every bidder is to bid based on its true valuation) and is also efficient in
that it allocates spectrum to users who value it the most. Evaluation results
from scenarios with real home distributions in urban and dense-urban
environments and using realistic TVWS spectrum availability maps show that
VERUM performs close to optimal allocation in terms of revenue for the
coordinating spectrum manager. Comparison with two existing efficient and
truthful multi-unit spectrum auction schemes, VERITAS and SATYA, shows that
VERUM fares better in terms of revenue, spectrum utilisation and percentage of
winning bidders in diverse conditions. Taking all of the above together, VERUM
can be seen to offer incentives to subscribed users encouraging them to use
TVWS spectrum through greater spectrum availability (as measured by percentage
of winning bidders) as well as to the coordinating spectrum manager through
revenue generation.
