Congestion control and resource allocation algorithms in multi-hop communication systems = 멀티홉 링크를 이용한 통신시스템에서의 혼잡 제어와 무선 자원 할당 기법 연구

Recently, researches in wireless communication systems using multihop links have been focused due to its capability to achieve extended coverage and high capacity. Thus, Wireless Local Area Network (WLAN) mesh networks and relay communication systems using multi-hop technique are focused in this thesis. Also, among Radio Resource Management(RRM) technique, we consider congestion control and resource allocation strategies for WLAN mesh networks and relay communication systems. Recently, WLAN mesh networks are attracting significant attention. Since the Institute of Electrical and Electronics Engineers (IEEE) 802.11 Medium Access Control (MAC) protocol has been designed for single hop networks, the performance of WLAN mesh networks with multihops degrades due to congestion, and buffer overflow in intermediate Mesh Nodes (MNs). In this thesis, we propose a new congestion control scheme which applies Adaptive Modulation and Coding (AMC) scheme and effective buffer usage to enhance the performance. AMC scheme uses multiple fragmentation thresholds, modulation levels and coding rates for various data sizes according to Channel State Information(CSI). Because CSI can be used more effectively to squeeze more bits into the medium, the throughput is enhanced. Simulation results show that the proposed scheme achieves higher throughput than other congestion control schemes. Next, we propose a novel resource allocation algorithm in relay communication networks. Many schemes improving the system performance have been researched in a multi-hop relay network. Especially, the resource allocation for relay networks is the most important issue to increase the coverage and the capacity efficiently with low power consumption. However, most existing algorithms have the high complexity with additional computation time because these algorithms assign a subcarrier to the lowest capacity hop one at a time. Thus, we propose sub-optimal joint subcarrier and power allocation algorith...
Advisors
Han, Young-Namresearcher한영남researcher
Publisher
한국정보통신대학교
Issue Date
2008
Identifier
392955/225023 / 020064613
Language
eng
Description

학위논문(석사) - 한국정보통신대학교 : 공학부, 2008.2 , [ ix, 50 p. ]

Keywords

WLAN mesh network; Radio Resource Management; relay network; 중계기 네트워크; 무선랜 메쉬 네트워크; 무선 자원 관리

URI
http://hdl.handle.net/10203/54984
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=392955&flag=t
Appears in Collection
School of Engineering-Theses_Master(공학부 석사논문)
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