## What's Bluetooth
* a short-range communications system.
* robustness,lower power consumption and low cost.
Two Forms of Bluetooth Technology
- Basic Rate(BR) & Low Energy(LE)
- Both includes:
- device discovery
- connection establishment
- connection mechanisms
Basic Rate(BR)
- Include optional
- Enhanced Data Rate (EDR)
- Alternate Media Access Control (MAC) Physical (PHY) layer extensions.
- Offers
- synchronous connections
- asynchronous connections
- Data Rate
- for BR, 721.2kb/s
- for EDR, 2.1Mb/s
- for HS with 802.11 AMP, 54Mb/s
Low Energy(LE)
- Designed for
- lower current consumption
- lower complexity
- lower cost than BR/EDR
- for use cases with lower data rates & lower duty cycles.
Bluetooth core system
- Consists of
- a Host
- one or more Controllers.
- Host is a logical entity defined as all the layers below the non-core profiles and above the HCI .
- Controller is defined as all the layers below the HCI layers.
- There are two types of Controllers: Primary Controllers & Secondary Controllers.
## Possible Configurations
* a BR/EDR Controller including the Radio, Baseband, Link Manager and optionally HCI.
* an LE Controller including the LE PHY, Link Layer and optionally HCI.
* a combined BR/EDR Controller portion and LE Controller portion into a single Controller.
* may additionally have one or more Secondary Controllers.
## Bluetooth Host and Controller Combinations

## Bluetooth Host and Controller Combinations

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