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研究生:曾國書
研究生(外文):Kuo-Shu Tseng
論文名稱:全新支援SDMA之無線AdHocMAC通訊協定
論文名稱(外文):A New Designed MAC Layer Protocol for Space Division Multiple Access in Wireless Ad Hoc Networks
指導教授:賴威光賴威光引用關係
指導教授(外文):Wei-Kuang Lai
學位類別:碩士
校院名稱:國立中山大學
系所名稱:資訊工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
論文頁數:48
中文關鍵詞:無基礎架構無線網路媒介存取控制聰明天線空分多址方向性天線
外文關鍵詞:Ad HocSmart AntennaSDMADirectional AntennaMAC
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目前來說,無線 ad hoc網路都是使用全方向性的天線,全方向性天線本身有許多實質上的限制,而使用方向性天線提供了許多的優勢,可以降低co-channel的干擾問題,提升空間的利用率,增加整體的throughput,節省傳送所需的Power,所以許多運用方向性天線在ad hoc網路的研究逐漸地被提出,然而這些已經提出的通訊協定,絕大部分都是針對IEEE 802.11通訊協定來做改進,在改進整體效能上仍然有限,因這些通訊協定並沒有設計出讓ad hoc上節點有同時傳送或是接收多個方向的能力。
在這篇論文中我們提出一個新的MAC通訊協定,我們採用了Adaptive Beam-forming System來降低干擾的問題,Adaptive Beam-forming System 可以讓Signal-to-interference-plus-noise-ratio (SINR)降到最低,而本篇論文所提出的MAC通訊協定將使ad hoc網路中的節點擁有同時傳送與同時接收的能力,我們提出MAC通訊協定的Handshake機制是採用如MACA/BI這樣以接收者為起始的Handshake機制,我們把機制中的代表Ready-to-Receive(RTR)詢問(Poll)的control packet改成一個代表Ready-to-Receive-and-Transmit(RTRT)兩用的control packet,來讓傳送者和接收者之間能夠同步,在模擬分析後,可以發現我們所提出的新MAC通訊協定能夠大幅的減緩Ad hoc中出現因Bottleneck節點降低整體網路效能的問題。
Typically, MAC protocols for mobile ad hoc networks assume omnidirectional antennas, and use of directional antennas offers many advantages, such as range extension, reduced co-channel interference, increased the degree of spatial reuse, improved the throughput of networks, and reduced the transmission power. There are many wireless ad hoc MAC protocol have been proposed. However, these protocols do not provide significant improvement of network performance because they can’t let nodes to support multiple simultaneous transmissions or receptions ability.
In this paper, we proposed a newly designed MAC protocols, we used adaptive beam-forming system to reduce the co-channel interference problem, and our proposed MAC protocol will enable nodes with multiple simultaneous transmissions and receptions ability. The handshake mechanism of proposed MAC protocol is that used receiver initialize handshake mechanism such as MACA/BI. We changed the Ready-to-Receive (RTR) control packet, which was used to poll neighbor nodes to be a dual-used control packet, Ready-to-Receive-Transmission (RTRT). Our simulation results will show that our proposed MAC protocol do exploit the advantage of space division multiple access that significantly reduced the problem of poor networks throughput which caused by bottleneck nodes in wireless ad hoc networks.
I. 導論 1
1.1研究動機 1
1.2研究想法 4
1.3 論文架構 5
II. 方向性天線與SDMA 6
2.1 天線系統 6
2.1.1 Sector Antennas 6
2.1.2 Diversity Antennas System 7
2.1.3 Antennas Array System 7
A. Switched Beam Antenna Systems: 9
B. Adaptive Beam-forming Antenna Systems: 10
2.2 ADAPTIVE BEAM-FORMING 原理 11
2.3 SPATIAL DIVISION MULTIPLE ACCESS (SDMA) 15
III. 相關的MAC PROTOCOL研究與分析設計 16
3.1 THE MAC LAYER PROTOCOL 16
3.2 全方向性的MAC 16
3.2.1 CSMA 16
3.2.2 CSMA/CA 17
3.2.3 MACA 18
3.2.4 DBTMA 18
3.2.5 MACA/BI 19
3.2.6 PDMA 20
3.3 WIRELESS CHARACTERISTICS 21
3.4 DIRECTIONAL ANTENNA (ANTENNA ARRAY) MAC 22
3.4.1 DBTMA/DA 22
3.4.2 Power Consumption 23
3.4.3 Throughput Enhancement 24
3.4.4 Smart Antenna on Ad hoc 24
3.4.5 ABF-CSMA/CA 24
3.4.6 Directional RTS/CTS 25
3.4.7 Novel MAC for Ad hoc with SDMA support 26
3.5 如何設計一個新的MAC支援SDMA 29
IV. THE PROPOSED SCHEME 31
4.1 PROPOSED MAC PROTOCOL 31
4.2 PROPOSED HANDSHAKE MECHANISM 31
4.3 PROPOSED PROTOCOL FINITE STATE MACHINE 36
4.4 NULL ANGLE TABLE 39
4.5 CONTROL PACKET FORMAT 39
V. 模擬分析 41
5.1 SIMULATION MODEL 41
5.2 SIMULATION RESULT 42
5.2.1 Data forward by bottleneck node 42
5.2.2 Complete Session Number 46
VI. 結論 48
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