GEO通信系统LLC协议设计及性能分析  

Design and Performance Analysis of GEO Telecommunication System LLC Protocol

作　　者：徐涛[1] 刘立祥[1] 

机构地区：[1]中国科学院软件研究所综合信息系统技术国家级重点实验室,北京100190

出　　处：《计算机工程》2012年第15期1-4,共4页Computer Engineering

基　　金：国家共性软件预研基金资助项目(6150103)

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。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.

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 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]