Bluetooth Channel Sounding vs. Bluetooth Classic
Comparing 2 standards across 13 specifications. 13 key differences identified.
Bluetooth Channel Sounding (standardized in Bluetooth Core Specification v6.0) introduces high-precision, secure distance measurement to Bluetooth Low Energy. Utilizing Phase-Based Ranging (PBR) across multiple RF channels combined with Round-Trip Time (RTT) time-of-flight measurements, it delivers centimeter-level spatial accuracy and relay-attack security for digital car keys and item tracking.
Bluetooth Classic encompasses Bluetooth Core Specifications v1.0 through v3.0 + HS. Operating in the 2.4 GHz ISM band across 79 channels with Frequency-Hopping Spread Spectrum (FHSS), it established wireless audio (A2DP), hands-free telephony (HFP), and serial peripheral connectivity (SPP/HID) at data rates up to 3 Mbps.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Bluetooth Specification
|
Bluetooth Core Specification v6.0 (2024) | — |
|
Ranging Technologies
|
Phase-Based Ranging (PBR) + Round-Trip Time (RTT) | — |
|
Target Accuracy
|
Centimeter-level (~10 to 30 cm under typical multipath) | — |
|
Operating Frequencies
|
Up to 79 channels stepped across 2.4 GHz ISM band | — |
|
Security Architecture
|
Cryptographically secure Sounding Sequences (Anti-Relay Attack) | — |
|
Primary Applications
|
Automotive digital keys, 'Find My' precision tracking, secure access control | — |
|
Bluetooth Generations
|
— | v1.0, v1.1, v1.2, v2.0 + EDR, v2.1 + EDR, v3.0 + HS |
|
Frequency Bands
|
— | 2.402 GHz to 2.480 GHz (79 RF channels @ 1 MHz spacing) |
|
Modulation Schemes
|
— | GFSK (Basic Rate 1 Mbps), π/4-DQPSK (EDR 2 Mbps), 8DPSK (EDR 3 Mbps) |
|
Max BR/EDR PHY Rate
|
— | 3 Mbps |
|
Frequency Hopping Rate
|
— | 1,600 hops/sec (AFH–Adaptive Frequency Hopping) |
|
Key Audio Profiles
|
— | A2DP (Advanced Audio Distribution Profile), HFP, HSP, AVRCP |
|
Supported Audio Codecs
|
— | SBC (Mandatory), AAC, aptX, aptX HD, LDAC |