BLE is a low energy model of Bluetooth designated 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, mistakes regulate, and go with the flow keep an eye on. The higher layers are Logical Hyperlink Regulate and Version Protocol (L2CAP), Commonplace Characteristic protocol (GATT), and Established Get right of 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 right of entry to the shared channel. Then again, 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 tool can function both in grasp or slave position. A grasp can handle more than one simultaneous connections with quite a few slave units, however a slave can best be hooked up to a unmarried grasp. Subsequently, a BLE community topology is a celebrity. Another way from vintage BT, discovery is completed in order that slave advertises on one or a couple of of the three precise commercial channels. Grasp scans those channels in an effort to uncover slaves. After discovery, knowledge transmission occurs within the type of connection occasions during which the grasp and the slave get up in synchrony to switch 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 trade such sensors, Far flung controllers
- BLE doesn’t reinforce streaming
- BLE have knowledge fee of 1 mbps however isn’t optimized for knowledge switch
- Layout for sending small package of knowledge exposing state