These updates have the potential to improve reliability, energy efficiency, and user experience in many Bluetooth ® enabled products. The latest version also incorporates a new Connection Subrating feature and removes the Alternate MAC and PHY (AMP) Extension. The latest version adds several feature enhancements, including enhancements to Periodic Advertising, Encryption Key Size Control, and Channel Classification. This paper, Bluetooth ® Core Specification Version 5.3 Feature Enhancements, summarizes the spec and explains each change. On 13 July 2021, the Bluetooth SIG released version 5.3 of the Bluetooth ® Core Specification. ![]() ![]() The release of the Bluetooth Low Energy (LE) radio, the introduction of LE Coded PHY for longer range, and, more recently, the release of Bluetooth ® Direction Finding are just a few examples of major new features and enhancements that have enabled Bluetooth technology to continue to expand its capabilities and redefine what is possible in wireless communication. Updates to the Bluetooth Core Specification cover a wide spectrum, from enhancements to existing features to the introduction of major new features that represent significant advancements to the technology and open new possibilities for wireless innovation. Like all Bluetooth specifications, the core specification is regularly updated and enhanced by the Bluetooth SIG Core Working Group to satisfy evolving technology and market needs. The Bluetooth Core Specification is one of the key building blocks that has defined the technology and enabled the development of a thriving ecosystem of interoperable Bluetooth enabled devices. The hard work and collaboration between Bluetooth Special Interest Group (SIG) member companies has driven the continuous innovation of the technology and has allowed Bluetooth technology to meet the growing demand for wireless communication across countless use cases for more than 20 years. One of the key reasons why Bluetooth ® technology has emerged as the global wireless standard powering the IoT is its rate of evolution.
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