Low earth orbit satellite switching method and device based on combination of graph theory and multi-attribute decision
A multi-attribute decision-making and low-orbit satellite technology, which is applied in the field of satellite communication, can solve the problems of frequent switching of communication links and poor service quality, and achieve the effect of clear user connection status
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Embodiment 1
[0057] This embodiment is used to illustrate the specific process of the low-orbit satellite switching method based on the combination of graph theory and multi-attribute decision-making, such as figure 1 As shown, it includes two parts, one part is the generation of directed graph of user switching satellite based on graph theory algorithm, and the other part is generation of user's satellite switching plan based on improved multi-attribute decision-making algorithm. Among them, the specific implementation steps of generating a directed graph for user switching satellite based on graph theory algorithm include:
[0058] S1. Obtain the satellite coverage time evolution diagram according to the satellite coverage of the user service duration period. In the specific implementation process, abstract processing is performed according to the satellite coverage situation of the user service duration period. Since the movement of low-orbit satellites is periodically predictable , the...
Embodiment 2
[0088] This embodiment is based on the optimal satellite switching plan obtained in Embodiment 1, and formulates channel reservation and occupancy strategies. After the user obtains the optimal satellite switching plan, the corresponding switching target satellite should reserve a corresponding channel for the user. In preparation for the arrival of the switch to achieve seamless switching. In a particularly dense user scenario, if multiple users reserve the same channel at the same time, they will form a FIFO (first in first out) queue to achieve orderly switching.
[0089] Usually, the reserved channel is not allowed to be used by other users, but this will greatly reduce the resource utilization of the system. therefore. The inventor formulated a channel reservation and occupancy strategy based on the user's satellite switching plan, which specifically includes: channel reservation according to the user's satellite switching plan, and judging whether the channel occupancy ...
Embodiment 3
[0092] Based on Embodiments 1 and 2, this embodiment proposes a user access and handover method based on the user's satellite handover plan, channel reservation and occupancy strategy, such as Figure 6 As shown, it specifically includes the following steps:
[0093] Step 1. The new user judges whether there are remaining satellites that can be accessed, and if there are, go to step 2. If there is no satellite, the access fails;
[0094] Step 2, judging whether there is a channel that satisfies the occupancy condition, if it exists, proceed to step 3, if it does not exist, proceed to step 4;
[0095] Step 3, the access is successful, and the new user's satellite switching plan is jointly obtained based on graph theory and multi-attribute decision-making, and the corresponding reserved channel is updated according to the new user's satellite switching plan;
[0096] Step 4, judging whether there is an idle channel, if it exists, proceed to step 3, if it does not exist, proceed...
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