IEEE 802.11 多重跳躍無線網路上有向性天線媒介存取控制之研究
On Media Access Control in IEEE 802.11 Multi-Hop Wireless Networks with Directional Antenna
Date Issued
2006
Date
2006
Author(s)
Tu, Chien Hao
DOI
en-US
Abstract
By using directional antenna in ad hoc networks, we expect to get the benefits of spatial reuse and extended transmission range. Existing CSMA/CA based MAC protocols with directional antenna have more hidden terminal problem than which using omni-directional antenna. And since the characteristic of the directional antenna, they introduce deafness and head of line blocking problems which will degrade the network capacity when using directional antenna in ad hoc networks. Some TDMA based MAC could solve these problems. However it’s hard to synchronize nodes in a distributed and decentralized way. In this thesis, we propose a CSMA/CA based MAC protocol with directional antenna called DCS-MAC. DCS-MAC can synchronize nodes in ad hoc network loosely by a simple, distributed and decentralized way. By dividing the control packets and data packets transmission time period, DCS-MAC alleviates hidden terminal and deafness problems and takes head of line blocking problem into consideration. Simulation results show that in a simple environment (few mobile nodes, few traffic loads) DCS-MAC has lower aggregate throughput than DMAC but DCS-MAC make traffic load fair. In a more complex environment (more nodes, diverse traffic loads) DCS-MAC outperforms DMAC in aggregate throughput and fairness.
Subjects
有向性天線
媒介存取控制
directional antenna
media access control
MAC
Type
thesis
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