# Adaptive Network Routing Technology for Near-Moon Space Cross-Domain Transmission
## 2 Hybrid Link Resource Prediction and Scheduling Model  
### Problem Description  
The interaction of information in the space near the Moon is shown in Figure 2. The communication network system is composed of three parts: the lunar surface network, the relay network, and the Earth-Moon network. In the future, there will be several types of users in the space near the Moon: lunar landers, inspectors, scientific research stations,astronauts, circumlunar satellites, lunar space stations, relay satellites, translational point navigation satellites, lunar surface base stations, etc. The task requirements for information transmission in the entire near-lunar space network include remote control, telemetry, data transmission, voice, video, navigation, and other data. Remote control commands and key telemetry are real-time tasks, while others are delay-tolerant services. For the various nodes and corresponding communication types in Figure 2, this article studies how to reasonably achieve the minimum data routing transmission time under different network conditions, reduce data loss rate, and improve the resource utilization of the entire network.  
With the continuous increase in future lunar surface inspection equipment and near-lunar orbiters, the number of communication nodes will increase accordingly. Relying on relay satellites as the main node to achieve interaction, thus forming a local area self-organized network, is a difficult means of ensuring quantity and bandwidth. At the same time, using a delay tolerance mechanism for relay nodes is the best mechanism for near-lunar space integration network.  
This study mainly focuses on the networking routing of cross-domain networks. To simplify the research problem, the following assumptions are made: (1) For a single node, the network domain it belongs to is known, and there is no situation where the node changes its network domain during operation; (2) Regardless of the physical layer channel switching and chain-building process time, the duration of data collection and transmission is equivalent to the shortened time window for chain building; (3) Not distinguishing between static and dynamic routing transmission, modeling the data transmission of the link mainly focuses on the on/off time window and transmission rate. Communication resources, including power supply and storage information, are considered to meet application requirements (negligible compared to whole satellite control and propulsion); (4) The orbit change process and abnormal area shutdown are not considered, only whether the orbits of each satellite node block the communication chain; (5) For the communication relay channel and rate limit of the relay satellite, it is equivalent to the established chain time window and communication rate limit.  
Therefore, when routing and transmitting data in the entire near-lunar space network, the following must be considered: (1) A unified communication model, interaction protocol, and fault mechanism for heterogeneous networks must be designed; (2) For different networks, they can be designed from a network domain and divided into a secondary  
Figure 2: Schematic diagram of spatial information exchange near the Moon.  
network as a whole, with transit satellites as intermediate interaction nodes; (3) When a node requests a data transmission task, it submits the data volume, priority, duration, earliest and latest start times of the task, as well as the minimum amount of data that can represent the completion of the task.