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학술지 Saturation Performance Analysis of Directional CSMA/CA in mmWave WPANs
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김미정, 김용선, 이우용
Wireless Communications and Mobile Computing, v.13 no.13, pp.1220-1233
John Wiley & Sons
11ZI1100, 유비쿼터스 인프라 연구, 김대식
The millimeter-wave (mmWave) band offers the potential for multi-gigabit indoor wireless personal area networks (WPANs). However, there are problems such as the short wavelength and high propagation losses. In order to compensate for these, it is highly recommended to use directional antennas at the physical layer. In this paper, directional carrier sense multiple access/collision avoidance (CSMA/CA) is analyzed in IEEE 802.15.3c, a standard for mmWave WPANs, under a saturated environment. A Markov chain model is presented and analyzed for the no-acknowledgment (No-ACK) mode. For the analysis, the device interaction is considered using directional antennas over a shared channel. A Markov chain model is presented in which the features of IEEE 802.15.3c such as backoff counter freezing and the effects of using directional antennas are incorporated. The maximal number of frames that can be transmitted concurrently and successfully is derived by an algorithm, and the system throughput and the average transmission delay are obtained in the closed forms. Numerical results show that the effects of using directional antennas in CSMA/CA and the overall analysis are verified by the simulation. The obtained results illustrate the physical layer impact on the CSMA/CA medium access control protocol, and these insights can be helpful in developing a medium access control protocol for enhancing the performance of mmWave WPANs. Copyright © 2011 John Wiley & Sons, Ltd.
directional CSMA/CA, IEEE 802.15.3c, millimeter wave, WPANs
KSP 제안 키워드
Average transmission delay, Backoff counter, Carrier sense multiple access with collision avoidance(CSMA/CA), Device interaction, Directional Antenna, IEEE 802.15.3c, Markov chain Model, Medium Access Control protocol, Multi-Gigabit, Numerical results, Overall analysis