摘要：

针对GEO链路延时大、误码率高的特点，提出基于位图的RBM-ARQ可靠传输算法。对GMPRS逻辑链路控制(LLC)层的可靠传输算法进行改进，采用保持更新终端状态的方法，以加强信道损伤的恢复能力。仿真实验结果表明，合理设置重传时间和重传计数可以提高LLC层的吞吐量、减少延迟，与传统的GMPRS LLC层可靠传输算法相比，RBM-ARQ算法能获得更好的传输性能。

关键词: GMPRS协议, 逻辑链路控制, 异步平衡模式, ARQ算法, RSR机制, RBM机制

Abstract:

This paper enhances the reliability of the data communication mechanism in GMPRS Logical Link Control(LLC) protocol, to address the issues of long delay and high bit error rates over GEO link. It proposes RBM-ARQ algorithm based on bitmap for reliable data communication. RBM-ARQ enhances the recovery of channel impairment by keeping the terminals updating the buffer status. Simulation results show when retransmission time and count are set properly, LLC layer throughput gets better and delay becomes smaller, and compared with GMPRS LLC layer acknowledged data transfer, RBM-ARQ algorithm achieves better performance and the better recovery of data.

Key words: GMPRS protocol, Logical Link Control(LLC), Asynchronous Balanced Mode(ABM), ARQ algorithm, RSR mechanism, RBM mechanism

中图分类号: 

• TP393