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It has also been chosen to serve as the baseline of the IEEE It is much likely that Bluetooth devices and wireless local area networks WLANs stations operating in the 2. These cooperative requirements have encouraged an intuitive architecture, called Bluestar, whereby few selected Bluetooth devices, called Bluetooth wireless gateways BWG , are also members of a WLAN, empowering low-cost, short-range devices to access the global Internet infrastructure through the use of WLAN basedhigh-powered transmitters . The interference generated by WLAN devices over the Bluetooth channel called as persistent interference, while the presence of multiple piconets in the vicinity creates interference referred to as intermittent interference. To combat both of these interference sources and provide effective coexistence, authors proposed a unique hybridapproach of adaptive frequency hopping AFH and a new mechanism called Bluetooth carrier sense BCS in Blue-Star. AFH seeks to mitigate persistent interference by scanning the channels during a monitoring period.
By the end of this phase, the whole network is covered by disjoint piconets. The final phase concerns the selection of gateway devices to connect multiple BlueStars.
The purpose of the third phase of our protocol is to interconnect neighboring BlueStars by selecting inter-piconet gateway devices so that the resulting scatternet is connected whenever physically possible. The main task accomplished by this phase of the protocol is gateway selection and interconnection.
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 ISM frequency band, and among Bluetooth piconets themselves.
Author has incorporated BCS into Bluetooth without any modifications to the current slot structure. Before starting packet transmission, the next channel is checked i.
If the next channel is busy or becomes busy during the sense window, the sender simply withholds any attempt for packet transmission, skips the channel, and waits for the next chance. Otherwise, packet transmission is carried out. A direct consequence of this approach is that, eventually, an ARQ automatic retransmission request packet will be sent when the slot is clear and the communication is carried out.
Future work in BlueStar includes defining a more elaborate capacity allocation algorithm.
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. The second phase takes care of BlueStar piconet formation. Given that each piconet is formed by one master and a limited number of slaves that form a star-like topology, we call this phase of the protocol BlueStars formation phase.
Based on the information gathered in the previous phase, namely, the ID, the weight, and synchronization information of the discovered neighbors, each device performs the protocol locally.
A device decides whether it is going to be a master or a slave depending on the decision made by the neighbors with bigger weight. By the end of this phase, the whole network is covered by disjoint piconets. The final phase concerns the selection of gateway devices to connect multiple BlueStars.
The purpose of the third phase of our protocol is to interconnect neighboring BlueStars by selecting inter-piconet gateway devices so that the resulting scatternet is connected whenever physically possible.
The main task accomplished by this phase of the protocol is gateway selection and interconnection. Bluetooth carrier sense BCS : BlueStar employs carrier sense so that intermittent-like interference can be avoided.
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