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evc11 发表于 2013-7-23 23:44
蓝牙4.0是不是有代替ANT+的趋势？
Bluetooth Smart is a new protocol created by the Bluetooth SIG organization, to compete with ANT+ in the ultra-low power wireless protocol space. Bluetooth Smart is included in Bluetooth 4.0 devices.
ANT and Bluetooth Smart are both ultra-low power, low bandwidth, wireless protocols operating in the 2.4GHz range with a very similar physical radio connection.
Both promise:
Ultra-low peak, average, and idle mode power consumption
Ability to run for years on single coin cell battery
Immunity to Interference
Multi-vendor Interoperability
Let's explore what makes them different.
POWER COMPARISON:
Summary:
Similar Active/Sleep power
ANT has more efficient Advertising
ANT has more efficient Scanning / Initiating
ANT requires less transactions per connections event
ANT requires less overhead to send the same amount of data
Result:
Each difference may be small individually, but the small differences can accumulate. The total difference will vary depending on the use case. Direct comparison of specific use cases have resulted in a 25-50% overall difference in battery life
BLUETOOTH USES STAR NETWORKING:
Connections are made between one master and multiple slaves
Multiple star networks can coexist
Star network to star network connections are not possible due to conflicting master timing
ANT NETWORKING:
ANT network mastering is per channel not per node
All ANT channels are timing independent, and can be either master or slave independently
Connecting across networks is not a special case with ANT, and any node can make a connection with any other nod
USE CASE COMPARISON:
PRACTICAL APPLICATION - SPIN BIKES:
Currently in the market as an ANT+ solution
Not possible with BT Smart star only network
CONCURRENT ANDROID APPLICATIONS:
ANT channels are fully independent
The ANT Android service enables applications to make use of this independent nature to run concurrently on the same ANT chip through virtual channels
ANT+ Profile Plug-ins will enable applications to be written without having to implement profiles, and allow multiple apps to use a single ANT+ Profile service. For example, multiple apps can be recording heart rate from a single heart rate monitor
BT Smart has not yet been released on Android
SUMMARY:
ANT is more efficient than BT Smart
ANT has the capability to connect any node in a network to any other node in the same network or a different network, providing the ultimate network flexibility
ANT network flexibility allows ANT+ to support many use cases that BT Smart cannot, such as one sensor to multiple displays, and peer to peer (master to master) communication
ANT+ Android service allows multiple independent applications to run concurrently using a single ANT radio, enabling support for multiple use cases at the same time
ANT+ is a proven technology with over 60 million devices in the market today. It just works. |
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发表于 2013-7-23 11:50
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