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CybersecurityManagementSecurity NewswireTechnologies & SolutionsCybersecurity News

NIST Formula May Help 5G Wireless Networks Efficiently Share Communications Frequencies

NIST

Photo courtesy of NIST

May 27, 2020

Researchers at the National Institute of Standards and Technology (NIST) have developed a mathematical formula that, computer simulations suggest, could help 5G and other wireless networks select and share communications frequencies about 5,000 times more efficiently than trial-and-error methods. 

According to NIST, the novel formula is a form of machine learning that selects a wireless frequency range, known as a channel, based on prior experience in a specific network environment. Described at a virtual online conferenc this week, the formula could be programmed into software on transmitters in many types of real-world networks.

The NIST formula is a way to help meet growing demand for wireless systems, including 5G, through the sharing of frequency ranges, also known as bands, that are unlicensed. Wi-Fi, for example, uses unlicensed bands — those not assigned by the Federal Communications Commission to specific users. The NIST study focuses on a scenario in which Wi-Fi competes with cellular systems for specific frequencies, or subchannels. What makes this scenario challenging is that these cellular systems are raising their data-transmission rates by using a method called License Assisted Access (LAA), which combines both unlicensed and licensed bands.

“This work explores the use of machine learning in making decisions about which frequency channel to transmit on,” NIST engineer Jason Coder said. “This could potentially make communications in the unlicensed bands much more efficient.”

"The NIST formula enables transmitters to rapidly select the best subchannels for successful and simultaneous operation of Wi-Fi and LAA networks in unlicensed bands. The transmitters each learn to maximize the total network data rate without communicating with each other. The scheme rapidly achieves overall performance that is close to the result based on exhaustive trial-and-error channel searches," says NIST. 

The NIST research differs from previous studies of machine learning in communications by taking into account multiple network “layers,” the physical equipment and the channel access rules between base stations and receivers, reports NIST. 

The formula is a “Q-learning” technique, meaning it maps environmental conditions — such as the types of networks and numbers of transmitters and channels present — onto actions that maximize a value, known as Q, that returns the best reward. By interacting with the environment and trying different actions, the algorithm learns which channel provides the best outcome. Each transmitter learns to select the channel that yields the best data rate under specific environmental conditions.

The study addressed indoor scenarios, such as a building with multiple Wi-Fi access points and cellphone operations in unlicensed bands. Researchers now plan to model the method in larger-scale outdoor scenarios and conduct physical experiments to demonstrate the effect.

For more information, please visit https://www.nist.gov/news-events/news/2020/05/nist-formula-may-help-5g-wireless-networks-efficiently-share-communications

KEYWORDS: communications security machine learning network security NIST

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