Part 15++: An Enhanced ID-based Approach for Etiquette and Enforcement Management in Unlicensed Band

Abstract

The open, simple and well-conceived global rules for the unlicensed bands operating in the industrial, scientific and medical (ISM) band has enabled tremendous product and service innovation. However, the argument can be made that the unfettered use of unlicensed bands could lead to certain tragedies of the commons and that changes to these rules might improve overall operation. We seek to assess whether simple additions or alterations to these rules might further the efficiency of these bands while not constraining or distorting this successful model. The current approach by spectrum regulators for mitigating harmful interference is through implementing conservative strategies, which cap the technical parameters of the devices. However, if these devices can be somehow informed about an impending interference, then it might be mitigated, improving the overall system efficiency. Moreover, there is a growing interest by other technologies to share this band, which could exacerbate potential interference issues. This calls for leaving behind some of the conservative operational aspects of Part 15 and allowing these devices to work in a more self-aware and self-governing environment1. Through our proposal for a Part 15++, we envision that unlicensed devices are able to avoid interference through a self-monitoring approach enabled by an identification (ID) mechanism. With denser and broader use of these bands, we believe that creating a common identification method might allow for a more efficient coexistence among heterogeneous technologies. The common ID structure could help a device self-monitor by providing information on: who is operating in a given space-time-frequency; who is causing observed interference; what are the alternatives to avoid that interference; and whether rule violations are occurring. This paper further investigates the benefit and cost of extending granular identification requirements in exchange for relaxation of the already successful Part 15 rules. Eventually, we aim at providing more freedom to the unlicensed band while keeping efficiency in check with enforcement as a byproduct of our initiative. At the end of the day, we need to decide if we are willing to tradeoff the conservative yet successful Part 15 restrictions for a more coordinated approach.