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en:iot-open:communications_and_communicating_sut:most_widely_used_wireless_communication_protocols [2019/02/18 19:36]
Agrisnik
en:iot-open:communications_and_communicating_sut:most_widely_used_wireless_communication_protocols [2019/03/07 10:19] (current)
pczekalski
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 Now Bluetooth covers two branches: BR/EDR (Basic Rate/​Enhanced Data Rate) for high-speed audio and file transfer connections and LE (Low Energy) for short burst connections ((What is Bluetooth, https://​www.bluetooth.com/​what-is-bluetooth-technology/​how-it-works)). Now Bluetooth covers two branches: BR/EDR (Basic Rate/​Enhanced Data Rate) for high-speed audio and file transfer connections and LE (Low Energy) for short burst connections ((What is Bluetooth, https://​www.bluetooth.com/​what-is-bluetooth-technology/​how-it-works)).
  
-Classical (prior to BLE and 4.0) Bluetooth networks can create ad-hoc, so-called WPAN (Wireless Personal Area Networks) sometimes referenced as Piconets. Bluetooth Piconet can handle up to 7+1 devices, where 1 device acts as Master, and it can contact up to 7 Slave devices. Only Master device can initiate a connection. Fortunately for the IoT approach, much Bluetooth hardware can act as Slave and Master simultaneously,​ constituting this way a kind of router; thus devices can constitute a tree-like structure called Scatternet (figure {{ref>​net_bt_scatternet}}).+Classical (prior to BLE and 4.0) Bluetooth networks can create ad-hoc, so-called WPAN (Wireless Personal Area Networks) sometimes referenced as Piconets. Bluetooth Piconet can handle up to 7+1 devices, where 1 device acts as Master, and it can contact up to 7 Slave devices. Only the Master device can initiate a connection. Fortunately for the IoT approach, much Bluetooth hardware can act as Slave and Master simultaneously,​ constituting this way a kind of router; thus devices can constitute a tree-like structure called Scatternet (figure {{ref>​net_bt_scatternet}}).
    
 <figure net_bt_scatternet>​ <figure net_bt_scatternet>​
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 </​figure>​ </​figure>​
  
-Bluetooth Low Energy (BLE) uses simplified implementation of the state machine thus is more constrained-devices friendly. It offers a limited range, and it is designed to expose the state rather than transmit streamed data. It provides a speed reaching up to 1Mbps if needed, however. It uses 2.4 GHz band but is designed to avoid interference with WiFi AP and clients. Communication is organised into 3 advertising channels (located "​between"​ WiFi) and 37 communication channels.\\+Bluetooth Low Energy (BLE) uses simplified implementation of the state machine thus is more constrained-devices friendly. It offers a limited range, and it is designed to expose the state rather than transmit streamed data. It provides a speed reaching up to about 1.4 Mbps (2 Mbps aerial throughput) ​if needed, however. It uses 2.4 GHz band but is designed to avoid interference with WiFi AP and clients. Communication is organised into 3 advertising channels (located "​between"​ WiFi) and 37 communication channels.\\
  
 Latest Bluetooth implementations (protocol version 5.0 and newer, implemented in mid-2017) offer a Bluetooth mesh network extending ubiquitous connectivity via many-to-many communication model, dedicated to IoT devices, lighting, Industry 4.0, etc. The Bluetooth mesh is layer-organised,​ and since there is no longer Master-Slave model used, but messages are relayed through the mesh, it is considered to be no longer the Scatternet because of its flat structure ((https://​blog.bluetooth.com/​introducing-bluetooth-mesh-networking)). Sample Bluetooth Mesh Network is presented in the figure {{ref>​bt-5-mesh}} (source: Bluetooth SIG, Mesh Profile Specification v1.0 ((https://​www.bluetooth.org/​docman/​handlers/​downloaddoc.ashx?​doc_id=429633&​_ga=2.211169244.858695694.1511814243-2000857715.1511814243))). Latest Bluetooth implementations (protocol version 5.0 and newer, implemented in mid-2017) offer a Bluetooth mesh network extending ubiquitous connectivity via many-to-many communication model, dedicated to IoT devices, lighting, Industry 4.0, etc. The Bluetooth mesh is layer-organised,​ and since there is no longer Master-Slave model used, but messages are relayed through the mesh, it is considered to be no longer the Scatternet because of its flat structure ((https://​blog.bluetooth.com/​introducing-bluetooth-mesh-networking)). Sample Bluetooth Mesh Network is presented in the figure {{ref>​bt-5-mesh}} (source: Bluetooth SIG, Mesh Profile Specification v1.0 ((https://​www.bluetooth.org/​docman/​handlers/​downloaddoc.ashx?​doc_id=429633&​_ga=2.211169244.858695694.1511814243-2000857715.1511814243))).
en/iot-open/communications_and_communicating_sut/most_widely_used_wireless_communication_protocols.txt ยท Last modified: 2019/03/07 10:19 by pczekalski
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