Research on Group handover strategy of low-orbit satellite users

Due to the high mobility of satellites and their limited coverage areas, multiple users in close proximity may simultaneously need to switch to another satellite to maintain stable communication as the current satellite moves out of range. This simultaneous switching can lead to a surge in user handover requests when the satellite is about to exit the coverage area, causing a sharp increase in the processing load of the target satellite. The core network’s limited processing capacity exacerbates this issue, making it difficult to handle a large number of handover requests within a short time. To alleviate the congestion caused by this surge in handover requests, this paper proposes a clustering algorithm for LEO (Low Earth Orbit) satellite user terminals based on adaptive spectrum clustering. Users are clustered according to their spatial location, target handover satellite, and other relevant attributes. These clusters are then managed by a group head that initiates a unified handover on behalf of all users in the group, effectively reducing system signaling overhead and improving the success rate of large-scale concurrent handovers.