25-09-2014, 09:34 AM
BLUESTAR
BLUESTAR.ppt (Size: 718.5 KB / Downloads: 23)
INTRODUCTION
The Bluetooth devices and wireless local area networks (WLANs) stations operating in the 2.4GHz frequency band should be able to coexist as well as cooperate with each other, and access each others resources. These cooperative requirements have encouraged an noval architecture, called BlueStar.
BlueStar produces mesh-like connected scatternet with multiple routes between pairs of nodes. It is a distributed solution. That is, all the nodes participate in the formation of the scatternet
BlueStars, a new scatternet formation protocol for multi-hop Bluetooth networks, that overcomes the drawbacks of previous solutions in that it is fully does not require each node to be in the transmission range of each other node and generates a scatternet whose topology is a mesh.
The protocol proceeds in three phases:
1.The first phase, topology discovery , concerns the discovery of neighboring devices . This phase allows each device to become aware of its one hop neighbors' ID and weight. By the end of this phase, neighboring devices acquire a "symmetric" knowledge of each other.
Bluetooth carrier sense (BCS)
BlueStar employs carrier sense so that intermittent like interference can be avoided. Carrier sensing is fundamental to any efficient interference mitigation with other technologies using the same frequency band, and among Bluetooth piconet themselves.
Future work in BlueStar includes defining a more elaborate capacity allocation algorithm.
ADVANTAGES
Long – range
Large scale mobility
Uninterrupted acces to bluetooth device
Superior audio quality