TY  - JOUR
T1  - QoS-aware Routing Algorithm in Satellite and Ground Integrated Networks
AU  - Lee, Sanghoon 
AU  - Choi, Hongrok 
AU  - Ryoo, Dongkyun 
AU  - Kim, Haeun 
AU  - Kim, Junhyeong 
AU  - Park, Jinho 
AU  - Park, Hyun 
AU  - Kim, Kihun 
AU  - Ahn, Sungjoon 
AU  - Pack, Sangheon 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2025
DA  - 2025/1/1
DO  - 10.7840/kics.2025.50.5.781
KW  - LEO Satellite
KW  - Multi-hop Network
KW  - Routing
KW  - QoS
KW  - Utility
AB  - Terrestrial networks face challenges in ensuring Quality of Service (QoS) due to limited coverage, especially in dead zones or long-distance communications. To address this, satellite-terrestrial integrated networks using Low Earth Orbit (LEO) satellites have gained attention. However, existing studies mainly consider transmission delay, neglecting the impact of long propagation distances, which hinders optimal routing. This paper proposes a utility-based QoS routing algorithm with a weighted Expected Propagation and Transmission Time (wEPTT) metric that accounts for both transmission and propagation delays. Experimental results show that wEPTT achieves lower latency and higher throughput than a conventional metric.