블루투수를 이용한 애드혹 네트워크에서의 효율적인 멀티미디어 데이터 전송
(An) Effective Multimedia Data Transmission in Ad-Hoc Networks Based on Bluetooth
블루투수 애드록네트워크 데이터전송;
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The bluetooth system, which is one of the wireless personal area network (WPAN) technologies, has the following advantages: it supports low power and it is comparatively cheap and has a small size. The bluetooth system successfully uses the wireless connection technology and is applied in different spheres, which are dependent on high data transmission rate - battery based devices as notebooks, PDAs and headsets. The maximum data rate is 723.3 Kbps when using ACL (Asynchronous Connection-Less) Link with DH5 (Data High Rate 5) packet type, in a piconet formed by two bluetooth devices (assuming no interference). However, if there are one master and two slave devices in a piconet, then the maximum data rate is reduced to a half (The maximum rate is about 360 Kbps), because a master device has to support the same data rate for all of the connected devices. And when there are more than three hops of data transmission, bluetooth system has to operate with scatternet constructed by many piconets. Data transmission from one piconet to another in a scatternet is possible only in an area where the slots are not overlapped in each of the two piconets and channels don't have the same value. Therefore, there is a defect in a scatternet which lowers the data transmission (The maximum rate is about 300 Kbps). In this paper, we propose the new ad-hoc network topology called "DoublePico (Double Piconet)". To construct the DoublePico, the device which performs functions of a relay station has two bluetooth devices, moreover it has to form two different piconets; the every device can link between two different piconets. Therefore, the device is included in two piconets. By linking two bluetooth devices which are different types, the two piconets are linked. Finally an ad-hoc network is formed. The method of DoubePico allows overcoming low data transmission in scatternet constructed by piconets. The method of DoublePico represented in this paper makes possible high data transfer rate (The maximum rate is about 450 Kbps) in bluetooth ad-hoc networks. This paper shows the results of a simulation which shows that DoublePico supports higher data rate than any existent ad-hoc networks in bluetooth system when it forms links of any type. By result of simulation, this paper shows that multimedia data (MPEG4: 320x240 sizes with 16 frames in a second) can be successfully sent in an ad-hoc network which is constructed by DoublePico when uses an ACL link with DH5 type of packet.