高速星上多体制交换技术研究

下一代天基网络将为陆、海、空、天多体制用户提供多样化的全球信息服务能力。高速星上多体制交换技术能够在一跳内完成多种用户体制的信息交互，降低对地面设施的依赖，实现全球天基组网。本项目针对星上交换面临的多协议族并存、高可靠性等关键问题开展研究，主要包括：（1）研究多维映射多协议族包解析方法。对不同协议数据包进行多维归一化映射，解决多协议族的字段互斥特性，设计基于最大区分效率的多协议族区分算法和快速包解析结构，对多协议族数据进行快速统一解析；（2）研究二级纵向聚合的多协议族流表构建方法。对多协议族字段进行数据抽象屏蔽多协议族的数据与语义的耦合，设计最长匹配长度聚合和最大压缩率聚合算法，实现流表的存储空间与协议数量的解耦，高效适应多协议场景；（3）研究自适应容错调度算法。建立星上交换调度算法的设计原则，设计基于空间辐射瞬时预测的自适容错调度算法，实现业务优先通过高可靠路径，提高交换结构的可靠性。

The next-generation space-based information network is argued to provide diversified global information service capabilities for land, sea, air and space based multi-system users. The technology of high speed on-board multi-system switching can complete information interaction among any users in one hop, reduce the dependence on ground stations, which facilitates global space-based networking. In order to meet the requirements of supporting coexistence of multiple protocol families and high reliability, the researches conducted in the project are as follows: (1) A multiple protocol family packet parsing method based on multi-dimensional mapping is proposed. In the method, multi-dimensional normalized mapping of different protocol family packets is conducted to solve field mutual exclusion in different protocol families. Furthermore, a multiple protocol family distinguishment based on maximum distinguishment efficiency and, a high speed parser are designed to accomplish fast unified parsing of multi-protocol data. (2) A multiple protocol family flow table construction method based on two-level longitudinal aggregation is proposed. The data and semantic coupling relationship is shielded by data abstraction. The longest matching length aggregation and the maximum compression ratio aggregation are designed to achieve the decoupling of the storage space of the flow table and the number of protocol families, which can efficiently adapt to multi-protocol scenarios. (3) A adaptive fault-tolerant scheduling algorithm is proposed. The design principles of on-board switching scheduling algorithm are firstly established. Furthermore, the proposed algorithm is based on space radiation instantaneous prediction to realize the high-reliability path with high priority, improve the reliability.