| Title |
Ground Relay Detour Method for Minimizing Overheadand Propagation Delay Caused by PAT in LEO Networks |
| Authors |
김서권(Seogwon Kim) ; 윤지승(Jiseung Youn) ; 김수형(Soohyeong Kim) ; 김동현(Donghyun Kim) ; 조성현(Sunghyun Cho) |
| DOI |
https://doi.org/10.5573/ieie.2024.61.11.38 |
| Keywords |
Low earth orbit satellite; Optical communication; PAT; Routing algorithm; 6G |
| Abstract |
To ensure global coverage in 6G next-generation wireless communications, Low Earth Orbit (LEO) satellite constellations are being considered. Recently, to meet the demand for high-capacity data processing, including streaming, connections via laser inter-satellite links (LISLs) between LEO satellites are being explored. Due to the narrow beam divergence angle in the milliradian range, precise alignment and maintenance of transmission and reception angles through the Pointing, Acquisition, and Tracking (PAT) process are required for LISLs. The high mobility of LEO satellites leads to low stability of LISLs, necessitating frequent PAT procedures to maintain accurate beam alignment. These frequent PAT processes result in high communication overhead, highlighting the need for research on efficiently reducing overhead messages. In this paper, we propose a space-ground relay detour method that considers relaying through ground stations from detour points or failure points stored in the routing table. Simulation results show that the proposed method reduces overhead message occurrences by approximately 40.3% compared to the ordinary detour techniques. |