ABSTRACT
In this paper, we proposed a backoff mechanism to improve the performance of initial ranging for the IEEE 802.16 standard. In the proposed scheme, the size of contention window in the initial ranging is combined with exponential and linear backoff mechanisms, and it is adjusted based on the current network environments. In addition, a threshold in the proposed scheme is set to find out the current network situation. If the contention window size is smaller than the threshold, the contention window size is tuned exponentially in response to a light network traffic load. On the other hand, when the contention window size is larger than the threshold, the contention window size is tuned linearly in response to a congested scenario. The numerical simulation results show that the proposed scheme can achieve a better performance in terms of collision rate, average access delay, and system throughput in both light and congested environments.
- IEEE 802.16 Standard-Local and Metropolitan Area Networks-Part 16: Air Interface for Fixed Broadband Wireless Access Systems, IEEE Std 802.16--2004.Google Scholar
- J. He, K. Guild, K. Yang, and H.-H. Chen. Modeling Contention Based Bandwidth Request Scheme for IEEE 802.16 Networks, IEEE Communications Letters, 11(8):698--700, August 2007.Google ScholarCross Ref
- H. T. Cheng, H. Jiang, and W. Zhuang. Distributed medium access control for wireless mesh networks, Wireless Communications and Mobile Computing, 6(6):845--864, August 2006. Google ScholarDigital Library
- Y. Yao, H. Zhu, and J. Sun. Dynamic Contention Slot Allocation for 802.16 Broadband Wireless Access Systems, Proc. IEEE ISCE'07, pages 20--23, June 2007.Google ScholarCross Ref
- A. Sayenko, O. Alanen, and T. Hamalainen. On Contention Resolution Parameters for the IEEE 802.16 Base Station, Proc. IEEE GLOBECOM'07, pages 4957--4962, November 2007.Google ScholarCross Ref
- L. Lin, W. Jia, B. Han, and L. Zhang. Performance Improvement using Dynamic Contention Window Adjustment for Initial Ranging in IEEE 802.16 P2MP Networks, Proc. IEEE WCNC'07, pages 1877--1882, March 2007.Google ScholarDigital Library
- Q. Pang, S. C. Liew, J. Y. B. Lee, and V. C. M. Leung. Performance evaluation of an adaptive backoff scheme for WLAN, Wireless Communications and Mobile Computing, 4(8):867--879, November 2004. Google ScholarDigital Library
- The Network Simulator, ns-2, http://hpds.ee.ncku.edu.tw/smallko/ns2/ns2.htmGoogle Scholar
Index Terms
- On semi-dynamic contention resolution scheme for IEEE 802.16 BWA systems
Recommendations
Discriminating Non-Congestion Losses by Exploiting Adaptive Initial/Maximum Backoff Window for IEEE 802.16 BWA Systems
In IEEE 802.16 BWA systems, the mandatory method of contention resolution is based on Truncated Binary Exponential Backoff (TBEB), with the initial backoff-window and the maximum backoff-window controlled by the BS. The values for these window ...
On the optimization of the contention resolution mechanism for IEEE 802.16 networks
The IEEE 802.16 standard defines a contention bandwidth request mechanism offering QoS-aware broadband access through a wireless medium. According to the standard, the Base Station (BS) is responsible for granting the requests issued by the Subscriber ...
Slot allocation algorithms in centralized scheduling scheme for IEEE 802.16 based wireless mesh networks
In IEEE 802.16 based wireless mesh networks (WMNs), TDMA (Time Division Multiple Access) is employed as the channel access method and only TDD (Time Division Duplex) is supported and there are no clearly separate downlink and uplink subframes in the ...
Comments