低轨卫星接入系统中基于位置信息的时隙分配协议

摘要

To solve the long end-to-end delay and low throughput problem in unified delayed allocation protocol with wide coverage and long propagation delay of access link in buoy satellite communication sys-tem,this paper proposes a position-based slot assignment protocol. Satellites use position information of bu-oy to control the start position of slot allocation in the protocol,achieving discrete slots allocation to increase the available transmission slot length and reduce transmission delay. The OPNET simulation results show that the proposed slot allocation protocol can significantly improve network throughput under single-channel transmission mode,and effectively reduce buoy satellite communication system′s access delay under either the single-channel mode or the dual-channel mode.%针对浮标卫星通信系统中卫星覆盖范围广、接入链路传播时延差异大的场景结构引起的统一延迟分配协议中端到端时延长、吞吐率低的问题，提出了一种基于位置信息的时隙分配协议。协议中卫星通过获取浮标位置信息来控制时隙分配的起点，实现时隙离散分配，增大可用传输时隙长度，同时降低传输时延。 OPNET 仿真结果表明所提出的时隙分配协议可以显著提高单信道传输模式下的网络吞吐量，并有效降低单信道与双信道模式下浮标卫星通信系统接入时的端到端时延。