Abstract
Directional antennas have the considerable benefits of higher antenna gain, long transmission distance and spatial reuse compared to omni-antennas. To support a directional antenna, IEEE 802.15.3c specifies a high data transmission rate and short frequency range communication based on the characteristics of 60GHz band. However, the contention-based protocol of IEEE 802.15.3c may cause channel collisions and throughput degradation as the number of stations in the network increases. In order to resolve this problem and reduce channel access latency, we propose an adaptive allocation algorithm in which the contention window size for optimal transmission probability is derived after the directional information has been obtained by means of AP control procedures. Extensive simulations demonstrate that the proposed algorithm outperforms the existing channel access scheme in IEEE 802.15.3c wireless personal area networks under different situations, especially when the number of contending stations is large.
Highlights
Spectrum utilization between 30 and 300 GHz has drawn considerable attention due to the possible high speeds
There are currently two standards for millimetre wave (mmWave) networks, namely IEEE 802.15.3c wireless personal area networks (WPANs) and European Computer Manufacturers Association (ECMA)‐387, which has been developed by the Technical Committee (TC)‐48
The association and channel time allocation procedures in IEEE 802.15.3c WPANs are as follows: once an STA is willing to join, a certain piconet listens to the beacon transmitted by the PNC, it sends the association request command frame to the PNC during the association contention access period (CAP) indicated in the received beacon
Summary
Spectrum utilization between 30 and 300 GHz has drawn considerable attention due to the possible high speeds. The mmWave has unique characteristics such as its short wavelength, high frequency, large bandwidth and high interaction with atmospheric constituents [4] Such characteristics are associated with many of its salient properties, such as multi‐gigabits per second, which enables it to support wireless applications requiring a high data rate, such as wireless high‐definition multimedia interface, wireless USB, IPTV/VoD, 3D gaming and intelligent transportation systems. When the CTA section is allocated for the sector that does not exist on any stations, the system performance can suffer degradation. We propose algorithm which allocates regular S‐CAP within dynamic CAP according to the number of STAs for each sector and dynamically allocates the required initial contention window size during the backoff procedure. We propose the dynamic allocation algorithm of CWmin in CTA depending on the number of stations and the type of application traffic in each sector. Int J Adv Robotic Sy, 2012, Vol 9, Special Issue: Advanced Technologies and Applications for Smart Robot and Intelligent Systems, 17:2012 www.intechopen.com
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