| Recently, along with the broader application field of Bluetooth techniques, transporting audio/video traffics over ACL links has became the major task of Bluetooth Piconet. This traffic makes Bluetooth Piconet having some delay sensitive, synchronous CBR streams. Therefore, it seems very important to propose a new and high effective MAC scheduling algorithm.Now, researchers among the world have developed some new mechanisms which are focusing on Bluetooth Piconet MAC layer scheduling. And they can be divided into three kinds: First, reordering the polling sequence of Slaves dynamically. The typical one is LUQF[9]. Second, allocating the bandwidth of each slave dynamically. The typical ones are LWRR[9], FEP[9], Adaptive E-limited[9] and AQAS[14]. Third, hybrid algorithm. Namely, reorders the polling sequence of Slaves and allocates the bandwidth of each slave at the same time. The typical one is FEP MLQF[9]. However, many of these algorithms are only easy variance of traditional classical ones, such as Round Robin[9], E-limited[9] and etc. They don't consider providing QoS for realtime traffic.Therefore, the author prompts a new facing QoS scheduling algorithm for Bluetooth Piconet MAC layer under this background. And the author also analyzes the performance of the algorithm using queuing theory. At last, the author concludes that the worst performance of the new mechanism will not worse than E-limited.Besides these, the author has used the OPNET network simulator to do some performance simulation, drawn the end-to-end delay and wasted bandwidth curves and compared with the AQAS of previous session schoolmate. Finally, the author has obtained the result that under three circumstances: first, every slave has same non-realtime traffic; second, every slave has non-realtime but different arriving rate traffic; third, one slave has realtime traffic and the others have non-realtime traffic. The new algorithm proposed by the author is better than AQAS. |
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