並列摘要
IEEE 802.16e has been deployed widely in the world. However, using IEEE 802.16e in a metropolis may suffer the shadow-of-building problem that prevents a Mobile Station (MS) from receiving signals of a Base Station (BS). Accordingly, IEEE 802.16j is proposed to resolve the shadow-of-building problem with a Relay Station (RS) to both overcome the coverage-hole problem and extend the signal coverage range of a BS. Since MSs use IEEE 802.16j to contend for bandwidth before transmitting data, they incur the collision when sending the bandwidth requests simultaneously. The collisions will delay data transmission time and make a negative impact on the performance. In this paper, we propose the Consecutive Bandwidth Request Scheme (CBRS) to avoid the collisions in IEEE 802.16j. The CBRS allows the MS to transmit multiple Ranging Codes in order to increase the probability of gaining bandwidth in the bandwidth contention when making the bandwidth request. The simulation results show that the CBRS can greatly increase throughput, decrease bandwidth contention times, and shorten data transmission time.
延伸閱讀
- Chang, Y. T. (2009). The Impact of Bandwidth Request Mechanism on Best Effort Connections in IEEE 802.16 WiMAX Networks [master's thesis, National Chiao Tung University]. Airiti Library. https://doi.org/10.6842/NCTU.2009.00711
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- 林韋志（2011）。A Hybrid Scheduling Mechanism for IEEE 802.16j Networks〔碩士論文，淡江大學〕。華藝線上圖書館。https://doi.org/10.6846/TKU.2011.00674
- lin, Y. H. (2011). A Schedule Based Power-Saving Bandwidth Request Mechanism for non-Real-Time Traffic in IEEE 802.16e System [master's thesis, National Chiao Tung University]. Airiti Library. https://doi.org/10.6842/NCTU.2011.00273
- Chiang, C. T. (2013). Bandwidth Utilization Improvement Scheduling Algorithms for IEEE 802.16 Wireless Broadband Networks [doctoral dissertation, Tamkang University]. Airiti Library. https://doi.org/10.6846/TKU.2013.01259