BLE is a low energy model of Bluetooth specific within the model 4.0 . of the bottom layers of BLE stack are Bodily (PHY) and the Hyperlink Layer (LL). PHY looks after transmitting and receiving bits. The Hyperlink Layer supplies medium get right of entry to, connection status quo, errors regulate, and drift regulate. The higher layers are Logical Hyperlink Keep an eye on and Variation Protocol (L2CAP), Conventional Characteristic protocol (GATT), and Standard Get entry to Profile (GAP). L2CAP is in a position to multiplex the information channels from the above layers and supplies fragmentation and reassembly for massive knowledge packets. Very similar to vintage Bluetooth (BT), BLE makes use of adaptive frequency hopping unfold spectrum to get entry to the shared channel. On the other hand, the selection of hops is forty three and the channel width is 2MHz versus seventy nine hops and 1MHz channel width in vintage BT.
How BLE save energy?
BLE software can function both in grasp or slave position. A grasp can handle more than one simultaneous connections with quite a lot of slave units, however a slave can handiest be hooked up to a unmarried grasp. Subsequently, a BLE community topology is a celebrity. In a different way from vintage BT, discovery is completed in order that slave advertises on one or a few of the 3 certain commercial channels. Grasp scans those channels as a way to uncover slaves. After discovery, knowledge transmission occurs within the type of connection occasions through which the grasp and the slave get up in synchrony to replace frames. Each units sleep the remainder of time.
Issues to find out about BLE/ BLE android –
- BLE function on GATT/ATT profile
- Use very much less power examine to vintage Bluetooth. Used for small burst of knowledge change such sensors, Faraway controllers
- BLE doesn’t fortify streaming
- BLE have knowledge fee of 1 mbps however isn’t optimized for knowledge switch
- Layout for sending small package of knowledge exposing state
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