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## 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:
    1. device discovery
    2. connection establishment
    3. 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)

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