Terminology

A

A2DP

Advanced Audio Distribution Profile. This protocol is used to support transmission of high-quality audio, for example, listening to music with a Bluetooth headset.

ACL

Asynchronous connectionless link. It is used to indicate the connection status of physical links between devices in the Bluetooth subsystem.

B

BLE

Bluetooth low energy. This protocol is supported since Bluetooth 4.0. Compared with traditional Bluetooth, BLE features low power consumption and long battery life.

BR

Basic rate. It is a Bluetooth wireless communication technology representing traditional Bluetooth, which is mainly used in scenarios such as file and audio stream transmission.

Bluetooth SIG

Bluetooth Special Interest Group, an organization that releases Bluetooth technical specifications. Developers can obtain detailed Bluetooth technical documentation from their official website.

C

Characteristic

Core data unit of the GATT service, which supports read/write operations and is uniquely identified by a UUID.

D

Descriptor

Data unit of a GATT characteristic, which describes the characteristic’s additional information and attributes. It supports read/write operations and is uniquely identified by a UUID.

E

EDR

Enhanced data rate. It is an enhanced version of BR that offers a higher data transmission rate. Together with BR, they are collectively referred to as traditional Bluetooth.

G

GATT

Generic Attribute Profile. It is the core protocol of Bluetooth Low Energy (BLE), defining the mechanism for Bluetooth communication and data transmission based on services, characteristics, and descriptors.

H

HFP

Hand Free Profile. This protocol is used to enable hands-free calling between Bluetooth devices, supporting bidirectional voice calls and control functions.

HID

Human Interface Device Profile. This protocol enables low-latency bidirectional communication between Bluetooth-enabled human-computer interaction devices, such as transmitting data between keyboards, mice, and gamepads, and hosts like mobile phones, tablets, and PCs.

M

MAP

Message Access Profile. This protocol can be used to synchronize data such as SMS and emails between Bluetooth devices.

MTU

Maximum transmission unit. It indicates the maximum size of a single data packet transmitted on the network, in bytes.

P

PAN

Personal Area Network. This protocol supports network sharing between devices.

PBAP

Phone Book Access Profile. This protocol can be used to synchronize phone book data such as contacts and call logs between Bluetooth devices.

Profile

Bluetooth technology protocol or capability in the Bluetooth subsystem, for example, A2DP, HFP, or HID.

R

RSSI

Received signal strength indicator. It is used in wireless communications to quantify the signal strength at the receiver in dBm.

S

Service

Service in the GATT protocol. It is a data structure containing multiple characteristics and dependent services. It represents a capability of a BLE device and is uniquely identified by a UUID.

SPP

Serial Port Profile. This protocol can be used to implement connection and data transmission between Bluetooth devices.

U

UUID

Universally Unique Identifier, which is a 128-bit string. In Bluetooth technology, it is used to identify different profile protocols, as well as services, characteristics, and descriptors in the GATT protocol.

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