To improve the anti-jamming capability and transmission efficiency of Bluetooth, the retransmission mechanism was worked out for baseband layer and L2CAP layer. In baseband layer, the adaptive packet selection strategy was presented, which utilized the times of retransmission to evaluate the channel quality. The packet that satisfied the biggest throughput of the current channel was chosen dynamically according to the times of retransmission. In L2CAP layer, in view of the shortcomings that data frames successfully received need to be transmitted once more, the selective retransmission algorithm was proposed, depending on the unique characteristic that Bluetooth could support a number of logical channels. The algorithm combines the retransmission mode and flow control mode, with no redundancy varieties of the protocol. Simulations and performance analysis indicate that system throughput and transmission efficiency get promoted with decrease of communication delay. It is easy to implement the algorithm.%为了提高蓝牙抗干扰能力与传输效率,从基带层重传和L2CAP层重传研究了蓝牙的重传机制.基带层提出了利用重传次数估计跟踪信道质量的自适应分组选择策略,根据当前信道的重传次数动态选择使其吞吐量最大的分组.在L2CAP层,针对连续重传需要传送己经准确接收的数据帧的缺点,提出了结合连续重传和流控制2种模式的选择重传算法,无需改变蓝牙协议.仿真与分析表明,算法能有效提高吞吐量与传输效率、降低时延,容易实现.
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