Tescom MTP200B, Operating Manual

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Introduction to Bluetooth Low Energy
133
Dual mode (BR/EDR/LE, Bluetooth Smart Ready)
It’s mode that both existing Bluetooth and Low energy technique exist in a device and mostly us
ed in Mobile phone and called as Bluetooth Smart Ready.
Single mode (BLE, Bluetooth Smart)
It is used in independent product such as sensor and called as Bluetooth Smart. Protocol structu
re is same as in Dual mode. RF, HCI(Host Controller Interface), L2CAP(Logical Link Control and
Adaptation Protocol) are equivalent to existing one in order to be compatible with existing Blue
tooth technique and some functions are added for Low energy technique. LL stage in low energ
y technique performs BB(Baseband) and LM(Link Manager) roles of existing Bluetooth.
Figure 20-2 Configurations between Bluetooth version and device types
20.1.2 Roles
BLE has two roles as Peripheral device or Central device. Usually, central would be smartphone that sc
ans and Peripheral would be sensor device such as Beacon.
Peripheral
It plays roles as Broadcaster and plays roles as Slave in Link Layer. Peripheral is mostly operated
with low power and has small battery capacity and used for device that has limited source.
Central
It plays role as Master in Link Layer. Central is used in devices that have rich resources such as m
emory, battery, and etc. and plays roles as Central in smartphone.