What is Dynamic Spectrum Access?

DSA technology enables radios to safely share multiple frequency bands without interfering with legacy and other protected wireless systems. DSA-enabled devices accomplish this through a novel combination of RF, signal processing, networking and detection technologies that are coupled with DSA software algorithms to provide substantially more communications capacity than is available through current static spectrum access practices.

DSA improves spectrum utilization in three dimensions: frequency, location and time. It enables a network to opportunistically use a wide range of frequencies at points in time and space when and where they are authorized and available. When a non-cooperative user is detected on the same channel, a DSA-enabled device immediately moves to an unoccupied channel. Because many frequencies are utilized only a small portion of the time and in a fraction of locations, DSA enables two or more networks to share a given spectrum band. It also enables a wireless service provider or spectrum user to deploy more than one application or service in a given band.

The SSC DSA Advantage

SSC pioneered and continues to lead the development of Dynamic Spectrum Access (DSA) technology. DSA technology enables radio devices to dramatically improve spectrum utilization, communications reliability and network deployment time. SSC’s technology employs a policy-based sensing approach to DSA. Devices using this solution continually assess the radio spectrum environment, and automatically and swiftly adjust frequencies in response to changing RF conditions. Policies that control the operation of devices are maintained in a database and pushed out to DSA-enabled devices, ensuring that they operate in accordance with regulatory, service provider and other stakeholder requirements. DSA makes wireless networks frequency agile – empowering devices at the edge with the ability to efficiently and effectively access available spectrum.

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SSC’s DSA offers a number of advantages for a wide variety of stakeholders, including:
  • RF equipment vendors – to build more spectrally efficient radios;
  • Wireless service providers – to better utilize their spectrum assets and access
    additional resources on an as-needed basis;
  • New market entrants – to gain access to spectrum that was previously
    inaccessible or too costly; and
  • Regulators – to ensure that spectrum licensees are protected when Cognitive
  • Radio technologies are deployed in the same or adjacent bands.

SSC Technical Publications

SSC actively participates in technical and professional societies. Our engineers will often publish papers based on their work, contribute to book chapters, and provide articles in professional journals. A partial list of publications is provided below.

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Publications List
Martin BH Weiss, Mohammed Altamimi, and Mark McHenry “Enforcement and Spectrum Sharing: A Case Study of the 1695-1710 MHz Band”. In 8th International Conference on Cognitive Radio Oriented Wireless Networks, pp. 7-12. IEEE, 2013. Read more.
F. Perich, E. Morgan, O. Ritterbush, M. McHenry, and S. D’Itri “Efficient DSA Implementation – MILCOM 2010”. Read more.
R. Foster, P. Tenhula, M. McHenry, and F. Perich “Cognitive Radio Access for Public Safety”, SDR ‘09 Conference, Washington, D.C., December 2009. Read more.
M. McHenry “The probe spectrum access method,” New Frontiers in Dynamic Spectrum Access Networks, DySPAN 2005. First IEEE International Symposium, pp.346-351, 8-11 Nov. 2005. Read more.
T.R. Newman, T.C. Clancy, M. McHenry, J.H. Reed “Case Study: Security Analysis of a Dynamic Spectrum Access Radio System,” GLOBECOM 2010, 2010 IEEE Global Telecommunications Conference , pp.1-6, 6-10 Dec. 2010. Read more.
Erpek, T.; McHenry, M.A.; Stirling, A “DSA Operational Parameters with Wireless Microphones,” DSA Operational Parameters with Wireless Microphones,”  In 2010 IEEE Symposium on New Frontiers in Dynamic Spectrum (DySPAN), pp. 1-11. IEEE, 2010. Read more.
M.A. McHenry, K. Steadman, A. Leu, E. Melick “XG DSA radio system”, DYSPAN 2008 – 3rd IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks, Vol. 3, no. 1, October 2008, pp. 497-507. Read more.
M. McHenry, K. Steadman, M. Lofquist “Determination of Detection Thresholds to Allow Safe Operation of Television Band ‘White Space’ Devices”, DYSPAN 2008 – 3rd IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks, Vol. 3, no. 1, October 2008, pp. 144-155. Read more.
F. Perich, R. Foster, P. Tenhula, M. McHenry “Experimental Field Test Results on Feasibility of Declarative Spectrum Management”, DYSPAN 2008 – 3rd IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks, Vol. 3, no. 1, October 2008, pp. 198-207. Read more.
M. McHenry, E. Livsics, T. Nguyen, N. Majumdar “A Description of the August 2006 XG Demonstrations at Fort A.P. Hill,” “XG Dynamic Spectrum Access Field Test Results”, IEEE Communications Magazine, Vol. 45, no. 6, June 2007, pp. 51-57. Read more.
K. Steadman, A.D. Rose, T.N. Nguyen, “Dynamic Spectrum Sharing Detectors”, In 2007 2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, pp. 276-282. IEEE, 2007. Read more.
P. Perich, “Policy-based Network Management for NeXt Generation Spectrum Access Control”. In 2007 2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, pp. 496-506. IEEE, 2007. Read more.
D.N. Hatfield, P.A. Tenhula “The Potential Value of Decentralized Trunking as Regulatory Precedent for the Introduction of Dynamic Spectrum Access Technology”, DYSPAN 2007 – IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks, no. 1, April 2007, pp. 597-605. Read more.
J.B. Bernthal, T.X. Brown, D.N. Hatfield, D.C. Sicker, P.A. Tenhula, P.J. Weiser “Trends and Precedents Favoring a Regulatory Embrace of Smart Radio Technologies”, DYSPAN 2007 – IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks, no. 1, April 2007, pp. 633-648. Read more.

SSC Spectrum Reports

SSC has performed numerous spectrum measurements throughout the years for various projects. These spectrum measurements are presented in the form of reports that are listed below.

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Publications List
Spectrum Occupancy Measurements Location 1 of 6: Riverbend Park, Great Falls, Virginia April 7, 2004. Read more.
Spectrum Occupancy Measurements Location 2 of 6: Tyson’s Square Center, Vienna, Virginia April 9, 2004. Read more.
Spectrum Occupancy Measurements Location 3 of 6: National Science Foundation Building Roof April 16, 2004. Read more.
Spectrum Occupancy Measurements Location 4 of 6: Republican National Convention, New York City, New York ,  August 30, 2004 – September 3, 2004. Read more.
Spectrum Occupancy Measurements Location 5 of 6: National Radio Astronomy Observatory (NRAO), Green Bank, West Virginia October 10 – 11, 2004. Read more.
Spectrum Occupancy Measurements: Chicago, Illinois November 16-18, 2005. Read more.
Spectrum Occupancy Measurements: Dublin Ireland April 16-18, 2007. Read more.
Spectrum Occupancy Measurements: Loring Commerce Centre Limestone, Maine September 18-20, 2007. Read more.
General Survey of Radio Frequency Bands – 30 MHz to 3 GHz. Read more.

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