Orbital Information and Distance based Conditional Handover in LEO-based Non-terrestrial Network
- 주제(키워드) NTN , Handover , Mobility
- 주제(DDC) 004.6
- 발행기관 아주대학교 일반대학원
- 지도교수 Jae-Hyun Kim
- 발행년도 2025
- 학위수여년월 2025. 2
- 학위명 석사
- 학과 및 전공 일반대학원 AI융합네트워크학과
- 실제URI http://www.dcollection.net/handler/ajou/000000034311
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
The development of sixth-generation (6G) networks aims to achieve global coverage through non-terrestrial networks (NTNs) utilizing low Earth orbit (LEO) satellites, with a focus on enhancing communication quality in high-traffic regions and areas lacking sufficient terrestrial infrastructure. However, the high altitude of LEO satellites increases the impact of signal fading, impairing accurate handover (HO) decisions by user equipment (UE). Additionally, the rapid mobility of the satellites results in frequent HOs, compromising network stability. This issue is particularly significant in Earth-moving cells (EMC) environments. Although conditional HO (CHO) and distance-based strategies have been introduced to address these challenges, they remain limited in effectively reducing unnecessary HOs (UHOs) and improving overall HO performance. To overcome these limitations, this thesis proposes an orbital information and distance (OID)-based CHO strategy. By using the positional relationship between the UE and satellite orbital information, the OID-based CHO enables more precise and efficient HO decisions, even in dynamic EMC environments where UE positions vary due to cell movement. Simulation results demonstrate that the OID-based CHO significantly minimizes UHOs and reduces signaling overhead compared to conventional approaches. Furthermore, the proposed strategy can be implemented without requiring additional information exchange, offering a practical and efficient solution for NTN-based LEO satellite communication in 6G NTN systems.
more목차
1 Introduction 1
1.1 Background and motivation 1
1.2 Contributions 2
1.3 Overview 3
2 Related works 4
2.1 Earth-moving cells environment 4
2.2 Handover procedure 5
2.2.1 Basic handover 5
2.2.2 Conditional handover 7
2.3 Handover triggering event 8
2.3.1 Signal strength-based condition 8
2.3.2 Distance-based condition 12
2.4 Recent research 15
3 Proposed OID-based conditional handover 17
3.1 Scenario 17
3.2 Definition of orbital distance 17
3.3 Proposed handover method and procedure 20
3.3.1 Handover triggering event 21
3.3.2 Preparation phase 23
3.3.3 Execution phase 24
4 Performance evaluation 29
4.1 System model 29
4.2 Key Performance Indicators 32
4.3 Results and Discussion 35
5 Conclusion 49
References 50
