Bluetooth® 4.1 Quick Reference Guide

Bluetooth® 4.1 is an evolutionary update to the Bluetooth Core Specification. It rolls up adopted Bluetooth Core Specification Addenda (CSA1, 2, 3 & 4) while adding new features and benefits. Bluetooth 4.1 improves usability for consumers, empowers innovation for product developers and extends the technology's foundation as an essential link for the Internet of Things.

NEW FEATURES & BENEFITS

1) Improving Usability

Bluetooth 4.1 extends the Bluetooth brand promise to provide consumers with a simple experience that “just works". It is engineered to work seamlessly with popular cellular technologies like LTE. It is designed to maintain connections with less frequent manual re-connection and delivers more efficient data exchange.

Advantages	Features	New for 4.1?	End User Examples
Engineered to work seamlessly with cellular technologies like LTE	Mobile Wireless Service Coexistence Signaling	Introduced with CSA3	It's important my LTE smart phone provides me with a high-quality user experience. I expect all of the technologies (Bluetooth, LTE, etc.) in my phone to work together seamlessly.
Maintain connections with less frequent manual intervention	Train Nudging & Generalized Interlaced Scanning	Yes	When I'm swimming, I can't carry a phone, but I want all my workout information captured on my Bluetooth Smart wearable device. When I'm finished with my swim and get close to my Bluetooth Smart compatible phone, the devices automatically reconnect and my information is efficiently synced to the application on my smartphone.
Exchange data more efficiently	L2CAP Connection Oriented Channels	Yes

2) Empowering Developer Innovation

Bluetooth 4.1 provides developers with even more flexibility to create innovative Bluetooth products and solutions.

Advantages	Features	New for 4.1?	End User Examples
Device supports multiple roles simultaneously (Enables a Bluetooth Smart Ready product to act as a Bluetooth Smart Ready Hub and Bluetooth Smart peripheral at the same time)	Dual Mode Topology and Link Layer Topology Software Features	Yes	I love my Bluetooth Smart enabled watch. Not only does it alert me to a message on my smartphone, but it captures data from my heart rate monitor when I run, and later sends it to the app on my tablet so I can share it with my running club.

3) Enabling the Internet of Things

Bluetooth 4.1 lays the groundwork for IP-based connections extending the central position for Bluetooth technology in the Internet of Things.

Advantages	Features	New for 4.1?	Examples
Devices will be able to setup a dedicated channel for communication (This is a foundational step for future support of IPv6 at the sensor level)	L2CAP Dedicated Channels	Yes	As a developer, I'm interested in using technologies that will provide the capacity for IP connectivity in the future.

Descriptions for all Bluetooth 4.1 features are available at: https://www.bluetooth.org/en-us/specification/adopted-specifications

ADDITIONAL UPDATES WITH BLUETOOTH 4.1

Eliminated the mandatory 'one new feature' requirement for using the specification Bluetooth 4.1—see core specification for details
Increased flexibility and simplified the requirements for using Bluetooth Smart and Bluetooth Smart Ready trademarks—see brand guide for details
Simplified end product and subsystem specification naming conventions—see brand guide for details

GET MORE INFORMATION

For the latest Bluetooth 4.1 technical details, tools and other information including an FAQ, Brand Guide and more, visit: https://www.bluetooth.org/en-us/specification/adopted-specifications

	Bluetooth Compatibility Guide and Chart A guide to understanding Bluetooth compatibility, including different types of Bluetooth technology and devices, and a compatibility chart for pairing devices.
	Bluetooth Assigned Numbers Document This document provides a comprehensive list of assigned numbers, codes, and identifiers used within the Bluetooth specifications. It is regularly updated and serves as a key reference for developers and implementers of Bluetooth technology.
	Brand Guide for Bluetooth Trademarks This comprehensive brand guide provides essential information and guidelines for the proper use of Bluetooth trademarks, including the Bluetooth word mark, figure mark, combination mark, and the Auracast trademarks. It covers requirements for licensees, correct and incorrect usage examples, formatting, spelling, and trademark symbol usage to ensure consistent brand representation.
	Bluetooth® Core Specification Version 5.4: Technical Overview A technical overview of the Bluetooth Core Specification Version 5.4, detailing updates and changes including Periodic Advertising with Responses (PAwR), Encrypted Advertising Data, LE GATT Security Levels Characteristic, and Advertising Coding Selection.
	Bluetooth Core Specification v5.1 Feature Overview A summary and explanation of the changes and new features introduced in the Bluetooth Core Specification version 5.1, including Direction Finding, GATT Caching Enhancements, Randomized Advertising Channel Indexing, Periodic Advertising Sync Transfer, and various minor enhancements.
	Bluetooth 5.3 Core Specification Feature Enhancements This document details the feature enhancements introduced in the Bluetooth Core Specification Version 5.3, including Periodic Advertising Enhancement, Encryption Key Size Control Enhancement, Connection Subrating, and Channel Classification Enhancement.
	Fitness Machine Service (FTMS) Bluetooth ICS Proforma This document provides the Bluetooth Implementation Conformance Statement (ICS) Proforma for the Fitness Machine Service (FTMS). It details the requirements, features, and specifications for fitness equipment utilizing Bluetooth technology, ensuring interoperability and compliance.
	Bluetooth Core Specification Version 5.2 Feature Overview This document summarizes and explains the three primary updates introduced in the Bluetooth Core Specification version 5.2, focusing on Enhanced Attribute Protocol (EATT), LE Power Control, and LE Isochronous Channels.