RACH-less Conditional Handover in LEO based Non-terrestrial Networks
- 주제(키워드) Conditional Handover , LEO
- 주제(DDC) 004.6
- 발행기관 아주대학교
- 지도교수 김재현
- 발행년도 2023
- 학위수여년월 2023. 8
- 학위명 석사
- 학과 및 전공 일반대학원 AI융합네트워크학과
- 실제URI http://www.dcollection.net/handler/ajou/000000032822
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
The emergence of non-terrestrial networks (NTN) as a new access network has led to a change in the communication paradigm, prompting the 3rd generation partnership project (3GPP) to start new radio (NR)-based NTN standardization. The wide coverage capabilities of NTN enhance the next-generation mobile communication network system, particularly with low earth orbit (LEO) satellites showing considerable commercial potential, thanks to reduced costs resulting from reusable rockets. Although most studies have focused on using NTN with LEO satellites to provide fully covered scenarios, it is also important to consider handover and link stability. LEO satellites have fast mobility, so they face challenges such as frequent handover and link instability. To address these challenges, this thesis proposes a random access channel (RACH)-less conditional handover (CHO) method in LEO-based NTN. To reduce the handover processing time and handover failure, the proposed algorithm reduced the random access (RA) procedure. In conclusion, the performance results demonstrate that the proposed RACH-less CHO outperforms conventional CHO, achieving better performance.
more목차
1 Introduction 1
1.1 Background and motivation 1
1.2 Contributions 2
1.3 Overview 3
2 Related work 4
2.1 Basic handover 4
2.1.1 Handover process and its related works 4
2.1.2 Random access procedure 7
2.2 Conditional handover 8
2.2.1 Conditional handover process and its related works 8
3 Proposed RACH-less Conditional Handover 11
3.1 Scenario 11
3.2 System model 11
3.3 RACH-less conditional handover 19
4 Performance evaluation 21
4.1 Simulation tool and environments 21
4.2 Key performance indicators 24
4.3 Results and analysis 30
5 Conclusion 44
