Title: A Cross-layer Approach of Link Adaptation in IEEE 802.16 Broadband Wireless Access Systems
Authors: Yu, Yu-Ting
Chao, Hsi-Lu
資訊工程學系
Department of Computer Science
Keywords: IEEE 802.16;link adaptation;PER;SNR;QoS
Issue Date: 2007
Abstract: IEEE 802.16 Broadband Wireless Access system (BWA) is a promising emerging technology. In the IEEE 802.16 standard, multiple data transmission rates are defined by employing different modulation and channel coding schemes. How to select a proper mode affects the system performance significantly. In this paper, an efficient link adaptation scheme with QoS support is proposed The proposed scheme takes both QoS demand and channel condition into consideration to determine a proper transmission mode. The QoS demand of a connection is represented as an expected packet error rate (PER). Based on this expected PER, the BS calculates the required signal-to-noise ratio (SNR) threshold of each mode. By comparing the measured SNR and all modes' SNR thresholds, the BS then suggests the SS a proper transmission mode. We evaluate the proposed scheme by simulations. The simulation results show that the link adaptation scheme improves the average system throughput and guarantees each connection's QoS demand
URI: http://hdl.handle.net/11536/12000
http://dx.doi.org/10.1109/WICOM.2007.490
ISBN: 978-1-4244-1311-9
DOI: 10.1109/WICOM.2007.490
Journal: 2007 INTERNATIONAL CONFERENCE ON WIRELESS COMMUNICATIONS, NETWORKING AND MOBILE COMPUTING, VOLS 1-15
Begin Page: 1958
End Page: 1961
Appears in Collections:Conferences Paper


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