트래픽 부하 기반 적응형 시맨틱 통신 기법

다국어 초록 (Multilingual Abstract)

In IEEE 802.11–based wireless LANs, the rapid growth of video
streaming, AR/VR, and IoT traffic frequently drives the access point
(AP) buffer into congestion, resulting in increased delay, packet loss, and
degradation of service quality. Conventional bit-based communication
transmits all data as raw bit streams, while most existing semantic
communication schemes employ a fixed bandwidth compression ratio
(BCR) and do not adapt to AP buffer dynamics, which limits their
effectiveness under time-varying traffic loads.
This thesis proposes an Traffic Load–based adaptive-BCR semantic
communication scheme that jointly considers the semantic importance of
data and real-time AP buffer state. AP buffer occupancy is continuously
monitored and classified into traffic-load regions, and a suitable BCR in
the range of 1/6 to 1/20 is selected for each region, with a hysteresis
mechanism to prevent frequent parameter switching near the thresholds.
The proposed scheme is evaluated using an ns-3–based discrete-event
simulation of an IEEE 802.11 WLAN under low, medium, high, and
mixed traffic-load scenarios. Performance is assessed in terms of AP
buffer occupancy, packet loss rate, end-to-end delay, and Effective PSNR
that accounts for packet drops. The results show that the proposed
adaptive-BCR semantic communication effectively alleviates AP buffer
saturation, reduces packet loss and delay, and improves Effective PSNR,
especially under medium and high traffic loads.

목차 (Table of Contents)

• Ⅰ. 서론 1
• 1.1 연구 배경 1
• 1.2 연구 목적 4
• 1.3 논문 구성 6
• Ⅱ. 배경지식 및 관련 연구 7
• 2.1 시맨틱 통신 8
• 2.2 AP 버퍼와 트래픽 부하 12
• 2.3 Bandwidth Compression Ratio 15
• 2.4 관련 연구 17
• Ⅲ. 제안 기법 20
• 3.1 하이브리드 시맨틱 통신 구조 22
• 3.2 트래픽 부하 기반 가변 BCR 조절 기법 24
• 3.3 시나리오 기반 트래픽 부하 기반 Adaptive-BCR 시맨틱 통신 처리 흐름 27
• Ⅳ. 실험 및 성능 평가 30
• 4.1 실험 환경 30
• 4.2 실험 결과 34
• 4.2.1 평균 지연(Latency) 비교 34
• 4.2.2 패킷 손실률(Drop Rate) 비교 37
• 4.2.3 유효 PSNR(Effective PSNR) 비교 39
• 4.2.4 혼합 트래픽 부하 시나리오 41
• Ⅴ. 결론 44
• 참고문헌 46
• Abstract 52