期刊名称：International Journal of Computer Science and Network Security
印刷版ISSN：1738-7906
出版年度：2010
卷号：10
期号：12
页码：217-224
出版社：International Journal of Computer Science and Network Security
摘要：The IEEE 802.16 standard which has emerged as a broadband wireless access technology is capable of delivering very high data rates. However, providing performance guarantees to delay sensitive applications like streaming media is still a challenge. In this paper, the media access control (MAC) layer of WiMAX has been discussed and simulated; exploiting its flexible features to dynamically construct the MAC-packet data units (MPDU). The overhead caused by the MAC-layer of the network is an important performance indicator, because it significantly influences the throughput. It is interesting to know how the MAC-efficiency is dependent on the physical-layer. The MAC-efficiency for point-to-multipoint point topology is simulated based on IEEE-802.16 standard under the influence of several overhead parameters: the number of subscriber stations; modulation techniques; error control coding techniques, and length of MAC-message��s PDU. As well as the performance of all over system is simulated. The results show these parameters have significant impact on the efficiency of MAC-layer. As well as the MAC overhead of the IEEE 802.16 system can reduces the throughput by approximately 10%. The performance analysis has shown that the IEEE 802.16 standard provides several means to adapt the MAC- and PHY-layer configuration to the system environment and user demands. Using the features efficiently, the system performance can be optimized by maintaining the robustness and operability of the system. Finally, some recommendations to reduce the overhead are put forward.
关键词：WiMAX-IEEE802.16; Medium Access Control efficiency; overhead; physical layer; MAC-layer
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