## 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 ![01](/images/2017/2017061201.png)

## Bluetooth Host and Controller Combinations ![02](/images/2017/2017061202.png)

谢谢收看

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