Bluetooth is a radio technology for wireless personal area networks in the 2.4 GHz ISM frequency band and allows short-range devices to be connected in the form of ad hoc networks. The Bluetooth medium access control protocol is based on a strict master/slave concept wherein any communication between slave devices has to go through the master. While this model is simple, the use of such a nonoptimal packet forwarding scheme incurs much longer delays between any two slave-devices as double the bandwidth is used by the master. In addition, if two or more devices want to communicate as a group, this can only be achieved by either multiple unicast transmissions or a piconet-wide broadcast from the master. To handle these issues efficiently, we propose a novel combination of dynamic slot assignment (DSA) and piconet partitioning. With DSA, the piconet master dynamically assigns slots to slaves so as to allow them to communicate directly with each other without any intervention from the master. Our proposed communication architecture provides for enhanced quality of service (QoS), better admission control, and multidevice conversation, which make a multicast-like communication feasible within the piconet. To widen the scope of DSA, we propose a QoS-aware enhanced DSA (EDSA) version where dynamic piconet partitioning and scatternet support are exploited by grouping devices into piconets as per their connection endpoints, enabling it to be employed over a scatternet. We have performed extensive simulations and observe that these schemes drastically enhance Bluetooth performance in terms of the delay and the throughput, while significantly reducing the network power consumption

Bluetooth is a promising wireless technology aiming at supporting electronic devices to be instantly interconnected into short-range ad hoc networks. The Bluetooth medium access control protocol is based on the master/slave concept wherein any communication between slave devices has to go through the master. While this model is simple, it incurs longer delay between any two slave devices due to the use of non-optimal packet forwarding scheme and the use of double the bandwidth at the master. Moreover, if more than two devices want to communicate as a group, this can only be achieved by either multiple unicast transmissions or a piconet-wide broadcast from the master. To handle these issues efficiently, we propose a novel combination of dynamic slot assignment (DSA) and piconet partitioning. With DSA, the piconet master dynamically assigns slots to slaves so as to allow them to communicate directly with each other without any intervention from the master. Such proposed communication architecture provides for quality of service (QoS) requests, admission control, and multi-device conversation by which a multicast-like communication is feasible within a piconet. To widen the scope of DSA, we propose QoS-driven enhanced DSA (EDSA) where dynamic piconet partitioning and scatternet support comes into picture. Devices are grouped in piconets according to their connection endpoints in EDSA, enabling it to be employed over a scatternet. We have performed extensive simulations and observe that these schemes drastically enhance Bluetooth performance in terms of delay and throughput, while significantly reducing network power consumption.

Bluetooth is a radio technology for wireless personal area networking (WPAN) operating in the 2.4 GHz ISM frequency band. The Bluetooth MAC protocol is based on the master/slave concept wherein any communication between slave devices has to go through the master. While this model provides for simplicity, it incurs longer delay between any two slave devices due to far from optimal packet forwarding, the use of double the bandwidth, and also it wastes additional energy at the master. Moreover, if more than two devices want to communicate as a group, this can only be achieved by either multiple unicast transmissions or a piconet-wide broadcast, clearly resulting in inefficiency. We propose a novel dynamic slot assignment (DSA) scheme whereby the master device dynamically assigns slots to slaves so as to allow them to communicate directly with each other without master intervention. This proposed mechanism also provides for quality of service (QoS) requests, and multi-device conversation by which a multicast-like communication is implemented within a piconet. Through extensive simulation, we observe that this mechanism greatly enhances Bluetooth performance in terms of delay and throughput while incurring extremely low overhead.

Bluetooth is a radio technology for wireless personal area networking (WPAN) operating in the 2.4 GHz ISM frequency band. We introduce a novel Bluetooth architecture (BlueStar) whereby selected Bluetooth devices, called Bluetooth wireless gateways (BWGs), are also IEEE 802.11 enabled so that these BWGs could serve as ingress/egress points to/from the IEEE 802.11 wireless network and thus provide access to WANs such as the Internet. We propose mitigating interference between Bluetooth and IEEE 802.11 by employing a hybrid approach of adaptive frequency hopping (AFH) and Bluetooth carrier sense (BCS) of the channels. AFH labels channels as "bad" or "good", and Bluetooth devices only access those channels in the "good" state, whereas BCS is used to avoid collision by sensing the channel prior to any transmission. By combining AFH and BCS, we minimize the effect of the worst-case interference scenario wherein both a Bluetooth and an IEEE 802.11 interface are colocated in a single device. BlueStar enables Bluetooth devices, in either a piconet or a scatternet, to access the WAN through the BWG without the need for any fixed Bluetooth access points, while utilizing the widely deployed base of IEEE 802.11 networks. We define the protocol stack employed by BlueStar as well as indicate how BWGs efficiently manage their capacity allocation through different systems. We also mathematically derive an upper bound on the number of BWGs needed in a scatternet so that uninterrupted access to all Bluetooth devices could be provided.

The seamless communication of data and voice over short-range, point-to-multipoint wireless links between mobile and/or stationary devices is becoming a reality by newly introduced Bluetooth radio technology for Wireless Personal Area Networking, which can support only up to 1 Mbps of nominal bandwidth. It is based on a master-slave model where double the resources are allocated for any slave-to-slave communication via the master. In addition, it does not have any mechanism to serve demands exceeding this capacity. In this paper, we employ the concepts of Internet Traffic Engineering to maximize the channel utilization and optimize the performance of QoS-sensitive applications, with minimum possible interference. We introduce two novel techniques of Pseudo Role Switching (PRS) and Pseudo PaRtitioning (PPR) to alleviate bottlenecks in the existing schemes in a proactive manner. We propose a two-layered approach wherein we first achieve the maximum possible throughput in existing network using PRS technique, and then dynamically partition piconets using the PPR to satisfy the increased demands. It has been observed that combining both PRS and PPR drastically enhances the aggregate network throughput while minimizing the interference. Through extensive performance evaluations, we show that our proposed schemes reduce up to 50 % of the network overhead and increase the overall throughput by 200%.