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经典蓝牙
Bluetooth Classic无线电,也被称为Bluetooth 基本速率/增强数据速率(BR/EDR),是一种低功率无线电,在2.4GHz非授权工业、科学和医疗(ISM)频段的79个频道上进行数据流。支持点对点设备通信,Bluetooth Classic主要用于实现无线音频流,已成为无线扬声器、耳机和车载娱乐系统背后的标准无线电协议。Bluetooth Classic无线电还能实现数据传输应用,包括移动打印。
低功耗蓝牙
Bluetooth 低能耗(LE)无线电是为非常低的功率操作而设计的。Bluetooth LE无线电在2.4GHz非授权ISM频段的40个信道上传输数据,为开发者提供了巨大的灵活性,以构建满足其市场独特连接要求的产品。Bluetooth LE支持多种通信拓扑结构,从点对点扩展到广播,最近又扩展到广播。 mesh,使Bluetooth 技术能够支持创建可靠的、大规模的设备网络。虽然最初以其设备通信功能而闻名,但Bluetooth LE现在也被广泛用作设备定位技术,以满足对高精度室内定位服务日益增长的需求。Bluetooth LE现在包括一些功能,使一个设备能够确定另一个设备的存在、距离和方向。
功能拓扑
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 with 2 MHz spacing (3 advertising channels/37 data channels) | 79 channels with 1MHz spacing |
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 |