Bluetooth Architecture: Concept Explained
I am trying to share some of my knowledge about the Bluetooth Architecture.
Here it goes:
Let us begin with a brief overview of what it contains and what it is intended to do.
The basic unit of a bluetooth system is a 'piconet', which consists of a master node and up to seven active slave nodes within a distance of 10 meters.
Multiple piconets can exist in the same (large) room and can be connected via a bridge node.
An interconnected collection of piconets is called a scatternet.
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Here it goes:
Let us begin with a brief overview of what it contains and what it is intended to do.
The basic unit of a bluetooth system is a 'piconet', which consists of a master node and up to seven active slave nodes within a distance of 10 meters.
Multiple piconets can exist in the same (large) room and can be connected via a bridge node.
An interconnected collection of piconets is called a scatternet.
In addition to the seven active slave nodes in a piconet, there can be up to 255 parked nodes in the net. These are devices that the master has switched to a low-power state to reduce the drain on their batteries. In parked state, a device cannot do anything except respond to an activation or beacon signal from the master. There are also two intermediate power states, hold and sniff, but these will not concern us here.
The reason for the master/slave design is that the designers intended to facilitate the implementation of complete Bluetooth chips for under $5. The consequence of this decision is that the slaves are fairly dumb, basically just doing whatever the master tells them to do.
At its heart, a piconet is a centralized TDM system, with the master controlling the clock and determining which device gets to communicate in which time slot. All communication is between the master and a slave; direct slave-slave communication is not possible.
The reason for the master/slave design is that the designers intended to facilitate the implementation of complete Bluetooth chips for under $5. The consequence of this decision is that the slaves are fairly dumb, basically just doing whatever the master tells them to do.
At its heart, a piconet is a centralized TDM system, with the master controlling the clock and determining which device gets to communicate in which time slot. All communication is between the master and a slave; direct slave-slave communication is not possible.
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