week6lecture12-資料下載頁
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【正文】 address but remains synchronized with the pico. ? A Parked device does not participate in the traffic but occasionally listens to the traffic of “M” to resynchronize and check on broadcast messages. 20 of 27 Interference Between Bluetooth and ? The WLAN industry specified three levels of overlapping: – Interference: multiple wireless works are said to interfere with one another if colocation causes significant performance degradation – Coexistence: multiple wireless works are said to coexist if they can be colocated without significant impact on performance. It provides for the ability of one system to perform a task in a shared frequency band with other systems that may or may not be using the same rules for operation – Interoperation: provides for an environment with multiple wireless systems to perform a given task using a single set of rules 21 of 27 Pico ? Collection of devices connected in an ad hoc fashion ? One unit acts as master and the others as slaves for the lifetime of the pico ? Master determines hopping pattern, slaves have to synchronize ? Each pico has a unique hopping pattern ? Participation in a pico = synchronization to hopping sequence ? Each pico has one master and up to 7 simultaneous slaves ( 200 could be parked) M=Master S=Slave P=Parked SB=Standby M S P SB S S P P SB 22 of 27 Forming a Pico ? All devices in a pico hop together – Master gives slaves its clock and device ID ? Hopping pattern: determined by device ID (48 bit, unique worldwide) ? Phase in hopping pattern determined by clock ? Addressing – Active Member Address (AMA, 3 bit) – Parked Member Address (PMA, 8 bit) SB SB SB SB SB SB SB SB SB M S P SB S S P P SB ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 23 of 27 Scatter ? Linking of multiple colocated picos through the sharing of mon master or slave devices – Devices can be slave in one pico and master of another ? Communication between picos – Devices jumping back and forth between the picos M=Master S=Slave P=Parked SB=Standby M S P SB S S P P SB M S S P SB Picos (each with a capacity of 1 Mbit/s)
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