- Bluetooth 4.1

The Bluetooth SIG announced formal adoption of the Bluetooth v4.1 specification on 4 December 2013. This specification is an incremental software update to Bluetooth Specification v4.0, and not a hardware update. The update incorporates Bluetooth Core Specification Addenda (CSA 1, 2, 3 & 4) and adds new features that improve consumer usability. These include increased co-existence support for LTE, bulk data exchange rates—and aid developer innovation by allowing devices to support multiple roles simultaneously.

New features of this specification include:

Mobile Wireless Service Coexistence Signaling
Train Nudging and Generalized Interlaced Scanning
Low Duty Cycle Directed Advertising
L2CAP Connection Oriented and Dedicated Channels with Credit Based Flow Control
Dual Mode and Topology
LE Link Layer Topology
802.11n PAL
Audio Architecture Updates for Wide Band Speech
Fast Data Advertising Interval
Limited Discovery Time

Notice that some features were already available in a Core Specification Addendum (CSA) before the release of v4.1.

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