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Simultaneous Transmission Opportunities: Leveraging Message in Message Capture Effect in IEEE 802.11 WLANs

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Authors

이준수

Advisor
김종권
Major
전기·컴퓨터공학부
Issue Date
2012-02
Publisher
서울대학교 대학원
Description
학위논문 (석사)-- 서울대학교 대학원 : 전기·컴퓨터공학부, 2012. 2. 김종권.
Abstract
The physical layer capture effect in multiple access wireless channels enables a receiver to decode a relatively strong signal correctly even in collision states. This phenomenon has been known to occur only if a Signal of Interest (SoI) arrives during the preamble duration of an early arrived signal. According to recent works, however, a new physical layer technique makes it possible to handle interference better and thus to facilitate more concurrent transmissions even if the signal arrived later arrives after the preamble time of an signal arrived earlier. It can permit more simultaneous transmissions, thus achieving higher throughput in wireless networks. This new capability is called Message in Message (MIM) capture effect. However, it is not an easy task to effectively utilize the opportunity of MIM capture effect since it should satisfy the condition that the packet arrived later has a high Signal to Interference plus Noise Ratio (SINR) greater than 10dB.
In this paper, we first analyzes the MIM capture probability that the MIM capture condition takes place in IEEE 802.11 Wireless LANs (WLANs)according to the geographical locations of mobile stations via a mathematical wireless channel model and a measurement study. It is the first analytic approach towards quantifying possibilities of performance gain from exploiting MIM capture effect in IEEE 802.11 WLANs. In addition, we show that the MIM capture effect can be leveraged to increase the possibility of simultaneous transmissions by tuning the transmission powers of contending stations. The analysis result shows that the MIM capture effect creates about 10% and 30% opportunity of simultaneous transmissions when the distance between transmitters is 100m and 150m, respectively. Furthermore, a power control scheme increases more opportunity of simultaneous transmissions by up to 10% approximately. Consequently, our analytic study shows concurrent transmissions harnessing MIM capture effect improve the network capacity of wireless LANs.
Language
eng
URI
https://hdl.handle.net/10371/155509

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