下面对于各种不同版本的蓝牙规范协议的区别，内容，进行整理如下：
表 1.1. 蓝牙规范协议版本
| 蓝牙协议 |
支持的速度 |
备注 |
| 版本号 |
发布日期 |
| Bluetooth v1.0和v1.0B |
|
|
|
| Bluetooth v1.1 |
|
|
- 对应的IEEE标准是IEEE 802.15.1–2002
- RSSI(Received Signal Strength Indicator)
|
| Bluetooth v1.2 |
|
实际：721Kb/s |
- 对应的IEEE标准是IEEE 802.15.1–2005
- AFH(Adaptive Frequency-Hopping spread spectrum)
- eSCO(Extended Synchronous Connections)
- HCI(Host Controller Interface)
|
| Bluetooth v2.0+EDR |
2004年 |
|
|
| Bluetooth v2.1+EDR |
2007-07-26 |
|
- SSP(Secure Simple Pairing)
- EIR(Extended Inquiry Response)
|
| Bluetooth v3.0+HS |
2009-04-21 |
|
- AMP (Alternative MAC/PHY)
- ->Bluetooth over 802.11 high-speed data transfer
- ->Bluetooth High Speed based on Wi-Fi
- L2CAP Enhanced modes
- Unicast Connectionless Data
- Enhanced Power Control
|
| Bluetooth v4.0 |
2010-06-30 |
|
- Bluetooth v4.0
- ==Bluetooth Smart
- =Classic Bluetooth+Bluetooth HS(High Speed)+Bluetooth BLE(Bluetooth Low Energy)
- GATT(Generic Attribute Profile)
- 带AES加密的SM(Security Manager)
|
| Bluetooth v4.1 |
2013-12-04 |
|
- Mobile Wireless Service Coexistence Signaling
- Train Nudging and Generalized Interlaced Scanning
- Low Duty Cycle Directed Advertising
- L2CAP Connection Oriented and Dedicated Channels with Credit Based Flow Control
- Dual Mode and Topology
- LE Link Layer Topology
- 802.11n PAL
- Audio Architecture Updates for Wide Band Speech
- Fast Data Advertising Interval
- Limited Discovery Time
|
| Bluetooth v4.2 |
2014-12-02 |
|
- LE Data Packet Length Extension
- LE Secure Connections
- Link Layer Privacy
- Link Layer Extended Scanner Filter Policies
- IP connectivity for Bluetooth Smart devices will soon be available via the new Internet Protocol Support Profile (IPSP)
- IPSP will add an IPv6 connection option for Bluetooth Smart, making it ideal for connected home and other IoT implementations
- Bluetooth 4.2 transfers data even faster by increasing the capacity of the Bluetooth Smart packets
- Bluetooth Smart gets smarter with industry-leading privacy settings that not only lower power consumption but also make it difficult for eavesdroppers to track a device through the Bluetooth connection without permission
- A consumer can have higher confidence they aren’t being tracked by beacons or anything else
|
蓝牙的信号的传输，物理上有多种协议实现。
详见：Controller_stack - List of Bluetooth protocols - Wikipedia, the free encyclopedia
蓝牙BD/EDR和蓝牙BLE之间的主要参数的区别和对比：
表 1.2. 蓝牙BD/EDR和蓝牙BLE主要参数对比
| 对比项 |
蓝牙BD/EDR |
蓝牙BLE |
| 射频物理上的通道 |
79个频段，1MHz的通道步长 |
40个频段，1MHz的通道步长 |
| 发现/连接 |
查询/传呼 |
广播 |
| 微微网从设备数目 |
活动的7个/共255个 |
无限制 |
| 设备地址隐私性 |
无 |
仅私有地址寻址有效 |
| 最大数据率 |
1-3Mbps |
1Mbps（GFSK调制） |
| 加密算法 |
E0/SAFER+ |
AES-CCM |
| 典型覆盖范围 |
30米 |
50米 |
| 最大输出功率 |
100mW(20dBm) |
10mW(10dBm) |
不同无线技术的功耗对比，包括蓝牙，UWB，ZigBee，WiFi：
TODO：这里：Android 4.2蓝牙介绍 - Innost的专栏 - 博客频道 - CSDN.NET解释的貌似不错，抽空整理过来。
