Page 57 - Mobile Computing

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Specifications of Bluetooth Technology

Bluetooth technology can be specified in two types:

 The Core Specification
 The Pro?les Speci?cation

I. The Core Specifications

The core specification is used to define the Bluetooth protocol stack and the
requirements for the testing and qualification process of the Bluetooth-based
products.

The core specification of Bluetooth Technology contains 5 layers:

1. Radio: It is used to specify the requirements for radio transmission such as

frequency, modulation, and power characteristics for a Bluetooth
transceiver.
2. Baseband Layer: It is used to define physical and logical channels, voice
or data link types, various packet formats, transmit and receive timing,
channel control, and the mechanism for frequency hopping and device
addressing. It also specifies point to point or point to multipoint links. The
length range of a packet can vary from 68 bits to a maximum of 3071 bits.

3. Link Manager Protocol (LMP): The Link manager protocol is used to
de?ne the procedures for link set up and ongoing link management.
4. Logical Link Control and Adaptation Protocol (L2CAP): It is used for
adapting upper-layer protocols to the baseband layer.
5. Service Discovery Protocol (SDP): It facilitates the Bluetooth device to

query other Bluetooth devices for device information, provided services,
and the characteristics of those services.

Here, the first three layers denote the Bluetooth module, whereas the last two
layers make up the host. The interface between these two logical groups is called
the Host Controller Interface.

II. The Pro?les Speci?cation

It provides usage models to show detailed information about using the Bluetooth
protocol for various types of applications.