Research On Formation And Communication Of Bluetooth Ad Hoc Network

Ad Hoc network is a autonomous wireless network without fixed infrastructure and centralized administration. It can provide a convenient support environment when the existing network infrastructure is not available. Currently, Ad Hoc network has been used widely in many fields. It will occupy an important position in the future communication technology field.Bluetooth is a global standard for short-range wireless data and voice communication .To its proximity-based wireless connectivity, it can quickly deploy the personal electronic equipments to Ad Hoc networks. As it is low consumption, low cost, high safety, Bluetooth is considered one of the promising technologies to be used in Ad Hoc networks. However, Because of the technical limitations and its own particular characteristics, the use of Bluetooth from Ad Hoc network also faces many challenges, including network formation.In this thesis, the performance of Ad Hoc network based on Bluetooth is analyzed from the number of piconets, the load of bridge, the power level of devices, the communications links between devices, and some rules that can improve the performance of the Bluetooth Ad Hoc networks are generalized. A novel algorithm of network formation is proposed according to these rules.The algorithm is executed at each node with no prior knowledge of the network topology, thus being fully distributed. It first partitions the network into Bluetooth piconets. The master of each master has higher levers of power. Then, these masters choose some devices of higher power level as bridges and interconnect the piconets into a connected scatternet.The algorithm preferential use devices of high power level as the master and bridge, so it can effectively extend the life time of network. Meanwhile, the bridge strategy that the algorithm uses makes each bridge only connect two piconets and any two piconets are connected only through a bridge. So it can effectively reduce the load of bridge and redundancy among the piconets, which will enhance the network performance.