Abstract
The Federal Communications Commission (FCC) has released the 3.5 GHz (3550-3700 MHz) band, termed Citizens Broadband Radio Service (CBRS), for shared broadband use between incumbent federal and secondary users through dynamic and opportunistic spectrum access. FCC requires that this band be operated and managed through the use of spectrum access systems ( $\mathit {SAS}$ s), which are to be deployed specifically for this purpose. The challenge is that $\mathit {SAS}$ requires that secondary users provide some of their private operational data, such as their physical location, identity and spectrum usage, in order for them to acquire spectrum availability information. In this paper, we propose a privacy-preserving $\mathit {SAS}$ framework, $\mathit {TrustSAS}$ , that synergizes state-of-the-art cryptographic mechanisms with blockchain technology to enable anonymous access to $\mathit {SAS}$ by protecting users’ privacy while still complying with FCC’s regulatory design requirements and rules. We evaluate the performance of $\mathit {TrustSAS}$ through theoretic analysis, computer simulation and testbed experimentation, and show that it can offer high security guarantees, making it suitable for $\mathit {SAS}$ environments without needing to compromise private information of its secondary users.
Highlights
The Federal Communications Commission (FCC) continues its effort to promote dynamic and opportunistic access to spectrum resources, and has recently promulgated, in its Report and Order [1], the creation of the Citizens Broadband Radio Service (CBRS) in the 3.5 GHz band (3550 - 3700 MHz)
In this paper, we propose TrustSAS, a trustworthy framework for spectrum access systems (SASs) that preserves SU s’ operational privacy while adhering to regulatory requirements mandated by FCC in the 3.5 GHz CBRS band
We have shown the privacy benefits that TrustSAS brings to SAS environments through security analysis
Summary
The Federal Communications Commission (FCC) continues its effort to promote dynamic and opportunistic access to spectrum resources, and has recently promulgated, in its Report and Order [1], the creation of the Citizens Broadband Radio Service (CBRS) in the 3.5 GHz band (3550 - 3700 MHz). Unlike SAS, these TVWS systems are not concerned with coexistence and interference protection amongst SU s, nor do they require SU s report their spectrum usage information to the databases upon determining which bands they will be using Some of these approaches have relied on the concept of k-anonymity, which provides a simple way to hide the location of an SU by sending k queries that include the location of the querying SU and some k − 1 randomly chosen other locations which do not necessarily belong to the same cluster or region.
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