An interference-aware power control MAC protocol for collision avoidance in wireless ad hoc networks

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An interference-aware power control MAC protocol for collision avoidance in wireless ad hoc networks


Author: Zou, Rongyuwei
Title: An interference-aware power control MAC protocol for collision avoidance in wireless ad hoc networks
Degree: M.Sc.
Year: 2016
Subject: Ad hoc networks (Computer networks)
Wireless communication systems.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Computing
Pages: ix, 45 pages : illustrations (some color)
Language: English
InnoPac Record:
Abstract: The wireless ad hoc networks, which doesn't rely on fundamental infrastructure, has the features of convenient and quick networking, high reliability and well flexibility. The transmission power of a station decides its transmission range, carrier sense range and interference range. It further affects the topology and spatial reuse of the station, which will influence network performance ultimately. Besides, the battery capacity is limited while the transmit energy consumption is the most of network energy consumption. Thus, power control at transmitter side is an important direction of wireless network. Another important direction is the data collision problem. In this dissertation, two mechanisms, DCF mechanism of CSMA/CA and symbol-level detection mechanism, are introduced to analyze the data collision problem in detail. DCF mechanism is a relatively simple RTS/CTS mechanism that cannot solve the hidden terminal problem fundamentally. A remote hidden terminal problem has been pointed out. When the hidden terminal is beyond the transmission range of the receiver, it cannot correctly decode the CTS packet and may cause data collision in wireless network. The symbol-level mechanism proposes a new RTS/S-CTS frame based on the standard RTS/CTS mechanism. It adds a signature detection block S-NAV to makes nodes, which beyond the receiver's transmission range, can correctly decode the S-CTS frame, thus solve the remote hidden terminal problem to the utmost extent. Since the S-CTS frame can be detected from destination that locates much farther than the transmission range, a power control mechanism is proposed based on the RTS/S-CTS mechanism in this dissertation. An S-Pr block, which restores the received power level information, is attached to the end of PHY layer for signature detection. Since the S-CTS' and ACK packet is relatively smaller than DATA packet, the RTS/S-CTS' mechanism makes power control at transmitter side to control the transmission power of RTS and DATA packet, and guarantees that all concurrency communication will not be collided. The dissertation finally evaluates the network performance of DCF mechanism, RTS/S-CTS mechanism and the RTS/S-CTS' mechanism on NS2 simulator. Compares the energy consumption and throughputs among the three mechanisms, the RTS/S-CTS' mechanism performance best with lower energy consumption and higher network throughputs.

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