基于确定性网络的网端一体流量交换机制

Network Terminal Integrated Traffic Switch Mechanism Based on Deterministic Network

摘要:

低轨卫星通信系统不受地理条件限制，相比于地面通信有覆盖范围广、运维成本低、部署周期短等优点，因此逐渐受到人们的关注。但对于低轨星座来说，拥有众多卫星节点的无线多跳网络，总传输和处理时延明显增大。确定性网络是近几年工业界新提出的一种网络技术，可以解决传统传统网络有关丢包和时延相关的需求，这与低轨卫星网络的需求相同。研究了地面网络确定性网络的关键技术和卫星网络的相关特征，将确定性网络技术应用到低轨星座，将ATS异步流量整形算法应用到星地间流量控制上，提出一种星载交换机制，优化了星载交换机的资源使用和丢包。借助NS3软件仿真了相关场景，并对结果进行分析，在多个仿真场景中均优化了星上资源利用，缓解了拥塞问题，在最优参数场景下实现了0丢包，吞吐量有5%以上的提升。

Abstract:

(Low Earth Orbit) LEO satellite communication system is not restricted by geographical conditions and compared to ground communication, there are wide coverage, low operation and maintenance costs, and the short deployment period than ground communication, therefore, it is gradually gaining the attention of more and more people. But as for the LEO satellite communication system, the total transmission and the processing latency increased significantly due to the wireless mesh network with many satellite nodes. A new network technology named deterministic networking is mentioned by the industry in recent years. The deterministic networking can solve the requirements of the traditional packet loss and delay which is matching the requirements of the LEO satellite networks. The key technologies of the deterministic network of the ground network and the relevant characteristics of the satellite network are studied. The deterministic network technology is applied to the LEO constellation, and the ATS asynchronous traffic shaping algorithm is applied to the inter satellite ground flow control,then proposes an on-board switch mechanism, which optimizes the resource usage and packet loss of the on-board switch. The relevant scenarios were simulated with NS3 software, and the results were analyzed. In many simulation scenarios, the utilization of on-board resources was optimized, which alleviated the network congestion problem. Under the optimal parameter scenario, zero packet loss was achieved, and the throughput was improved by more than 5%.