Table of contents
1. Product classification
1. Bluetooth® Classic
Bluetooth ClassicThe radio, also known as Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR), is a low-power radio operating in the 2.4GHz unlicensed Industrial, Scientific, and Medical (ISM) Data streaming is performed on 79 channels of the band. Supports peer-to-peer device communication and is primarily used to enable wireless audio streaming and has become the standard radio protocol behind wireless speakers, headphones, and in-car entertainment systems. Radio also enables data transmission applications, including mobile printing. Bluetooth ClassicBluetooth Classic
2.4GThe frequency band refers to the frequency range of 2.4GHz. In wireless communications, this frequency band is commonly used for Wi-Fi networks and Bluetooth devices. It is actually a range value covering the frequency range from2.400 GHz到2.4835 GHz. This frequency band is divided into multiple channels, and interference is usually avoided by selecting different channels.
2. Bluetooth® Low Energy (LE)
Bluetooth 低能耗（LE）The radio is designed for very low power operation. Bluetooth LE radios transmit data on 40 channels in the 2.4GHz unlicensed ISM band, providing developers with tremendous flexibility to build products that meet the unique connectivity requirements of their markets. Bluetooth LE supports a variety of communication topologies, extending from point-to-point to broadcast and, more recently, to broadcast. Mesh enables Bluetooth technology to support the creation of reliable, large-scale device networks. While initially known for its device communication capabilities, Bluetooth LE is now also widely used as a device positioning technology to meet the growing demand for high-precision indoor positioning services. Bluetooth LE now includes features that enable one device to determine the presence, distance and direction of another device.
3. The difference between the two
| Bluetooth Low Energy (LE) | Bluetooth Classic | |
|---|---|---|
| Frequency Band | 2.4GHz ISM Band (2.402 – 2.480 GHz Utilized) | 2.4GHz ISM Band (2.402 – 2.480 GHz Utilized) |
| Channels | 40 channels, 2MHZ intervals (3 advertising channels/37 data channels) | 79 channels, 1MHZ apart |
| Channel Usage | Frequency-Hopping Spread Spectrum (FHSS) | Frequency-Hopping Spread Spectrum (FHSS) |
| Modulation | GFSK | GFSK, π/4 DQPSK, 8DPSK |
| Data Rate | LE 2M PHY: 2 Mb/s LE 1M PHY: 1 Mb/s LE Coded PHY (S=2): 500 Kb/s LE Coded PHY (S=8): 125 Kb/s | EDR PHY (8DPSK): 3 Mb/s EDR PHY (π/4 DQPSK): 2 Mb/s BR PHY (GFSK): 1 Mb/s |
| Tx Power* | ≤ 100 mW (+20 dBm) | ≤ 100 mW (+20 dBm) |
| Rx Sensitivity | LE 2M PHY: ≤-70 dBm LE 1M PHY: ≤-70 dBm LE Coded PHY (S=2): ≤-75 dBm LE Coded PHY (S=8): ≤-82 dBm | ≤-70 dBm |
| Data Transports | Asynchronous Connection-oriented Isochronous Connection-oriented Asynchronous Connectionless Synchronous Connectionless Isochronous Connectionless | Asynchronous Connection-oriented Synchronous Connection-oriented |
| Communication Topologies | Point-to-Point (including piconet) Broadcast Mesh | Point-to-Point (including piconet) |
| Positioning Features | Presence: Advertising Direction: Direction Finding (AoA/AoD) Distance: RSSI, HADM (Coming) | None |
The device must not exceed the maximum allowable transmit power level specified by the regulatory agency having jurisdiction over the area in which the device is sold or intended to operate. Implementers should be aware that the maximum transmit power level permitted by a given set of regulations may not be the same for all modulation modes.
FHSS is the abbreviation of Frequency-Hopping Spread Spectrum, which is frequency hopping spread spectrum technology. FHSS is a communication method that accepts signals from both ends using a specific type of narrow-band carrier under synchronous and simultaneous conditions. For a non-specific receiver, the jitter signal generated by FHSS is just impulse noise. FHSS divides the signal into a series of independent narrowband channels and frequently switches between these channels at fixed time intervals. This random frequency change causes the signal to exhibit diffusion characteristics on the spectrum, thereby improving anti-interference and security.
GFSKIs a type of FSK modulation that uses a Gaussian filter to shape the bit stream before modulation. It is widely used in Bluetooth and other low-cost, low-power communication systems.
π/4 DQPSKIs a type of differential phase shift keying modulation that uses a π/4 phase offset to increase data rates and improve error performance. It is widely used in GSM and other mobile communication systems.
8DPSKIs a type of differential phase shift keying modulation that uses 8 levels of phase offset to increase data rates and improve error performance. It is widely used in high-speed digital communication systems.
Modulation techniques are used to convert a digital bit stream into an analog signal that can be transmitted over a communications channel. Different modulation techniques have different advantages and disadvantages, and are chosen based on specific communication requirements and system constraints.
2. Shipment volume
3. Directions that need to be strengthened in the future
LE Audio: Building on the innovations of 2020, LEAudio will improve the performance of Bluetooth@audio, add support for hearing aids, and enable Auracast broadcast audio, an innovative new Bluetooth feature that has the potential to once again change the way we experience audio and Connect with the world around us.
High-Accuracy Distance Measurement: Bluetooth@wireless technology's growing device location feature set: currently includes presence (via broadcast), range (via RSSI), and direction finding (via AoA/AoD). A specification development project is currently underway to enable high-precision distance measurement between two Bluetooth-enabled devices. This feature is expected to improve the performance of location systems and digital key solutions.
Higher Data Throughput: Today, more and more use cases and applications are looking for greater data transfer performance, as well as greater support for streaming, and can benefit from the higher data rates of the Bluetooth LE PHY. Work is currently underway to address this growing market opportunity.
Solution area segmentation:
Audio Solutions Area – Main Applications
Digital transmission solution field - main applications
Positioning Solution Areas – Main Applications
Networking solution areas - main applications
4. Technology industry segmentation
5. Study materials
1. Bluetooth official website
蓝牙官网：https://www.bluetooth.com/zh-cn/
The official Bluetooth website provides some Bluetooth learning materials:
2. Great Blog——Yu Zhongjun
Bluetooth protocol stack in depth
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