RFBLE Advertising and Data Channels Explained
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This page provides information about the list of BLE (Bluetooth Low Energy) channels, covering both advertising and data channels.
Introduction
- BLE (Bluetooth Low Energy) is the latest in the series of Bluetooth standards published by Bluetooth SIG. The latest version is 5.1, released after v4.2 and v5.0.
- Devices (Initiator/master and Advertiser/slave) communicate in point-to-point and broadcast modes using advertising and data channels.
Figure 1: Bluetooth Smart or BLE frequency channels
The figure above depicts a list of BLE (Bluetooth Low Energy) channels. Bluetooth operates in the 2.4 GHz ISM Band, spanning from 2400 to 2483.5 MHz. BLE channels are spaced 1 MHz apart.
Let’s delve into the use and function of these BLE channels, along with their frequency values.
BLE Advertising Channels
- These channels carry broadcast data for applications.
- They facilitate the discovery of slaves for connection purposes.
- BLE devices use these channels to transmit/receive advertising packets of various types, carrying advertising channel PDUs.
| BLE Channel Number | Frequency Value |
|---|---|
| 37 | 2402 MHz |
| 38 | 2426 MHz |
| 39 | 2480 MHz |
BLE Data Channels
- Once a connection is established between master and slave, devices can exchange data.
- This is achieved by exchanging data channel PDUs during scheduled connection events.
- Master and slave BLE devices utilize these data channels for transmission/reception.
| BLE Channel Number | Frequency Value |
|---|---|
| 0 | 2404 MHz |
| 1 | 2406 MHz |
| 2 | 2408 MHz |
| 3 | 2410 MHz |
| 4 | 2412 MHz |
| 5 | 2414 MHz |
| 6 | 2416 MHz |
| 7 | 2418 MHz |
| 8 | 2420 MHz |
| 9 | 2422 MHz |
| 10 | 2424 MHz |
| 11 | 2428 MHz |
| 12 | 2430 MHz |
| 13 | 2432 MHz |
| 14 | 2434 MHz |
| 15 | 2436 MHz |
| 16 | 2438 MHz |
| 17 | 2440 MHz |
| 18 | 2442 MHz |
| 19 | 2444 MHz |
| 20 | 2446 MHz |
| 21 | 2448 MHz |
| 22 | 2450 MHz |
| 23 | 2452 MHz |
| 24 | 2454 MHz |
| 25 | 2456 MHz |
| 26 | 2458 MHz |
| 27 | 2460 MHz |
| 28 | 2462 MHz |
| 29 | 2464 MHz |
| 30 | 2466 MHz |
| 31 | 2468 MHz |
| 32 | 2470 MHz |
| 33 | 2472 MHz |
| 34 | 2474 MHz |
| 35 | 2476 MHz |
| 36 | 2478 MHz |
References
- BLUETOOTH CORE SPECIFICATION Version 5.1
- Previous versions of Bluetooth 5.0 or Bluetooth Low Energy (BLE)
