Utility based channel aware MIMO downlink scheduling in IEEE802.16e broadband wireless system | ||||
The International Conference on Electrical Engineering | ||||
Article 31, Volume 6, 6th International Conference on Electrical Engineering ICEENG 2008, May 2008, Page 1-22 PDF (276.75 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/iceeng.2008.34228 | ||||
View on SCiNiTO | ||||
Authors | ||||
Suzan M. Shoukry1; Khaled. F. Elsayed2; Ali. El Moghazy3; Amen Nassar2 | ||||
1Higher Technological Institute. | ||||
2Cairo University. | ||||
3Military Technical College. | ||||
Abstract | ||||
Abstract: One of the most important features of IEEE802.16e is the ability of sophisticated QoS provisioning. The basic approach for providing the QoS guarantees in IEEE 802.16e is that the uplink and downlink scheduling at the base station (BS). To maximize usage of available resources and take advantage of the varying channel condition at the subscriber stations (SSs), adaptive and dynamic scheduling techniques are typically used. After making the scheduling decision, the BS informs all SSs about the scheduling decision at the beginning of each frame using the MAP messages. In this paper, we propose a new adaptive resource allocation and scheduling scheme for RT-downlink traffic in a single cell MIMO-based IEEE802.16e broadband wireless system. Our scheme is based on cross-layer approaches, which improves system performance in terms of increasing system throughput and provide better quality of service for users in terms of reducing Head Of Line (HOL) packet delays. We use a utility based framework to provide the link between physical layer and data link layer. In this architecture a new utility function is used. The subchannelization scheme we used is based on contiguous subcarriers in WiMAX is called band adaptive modulation and coding (AMC). To improve throughput, adaptive modulation and coding (AMC) at the physical layer is used. We provide simulation results comparing our proposal with different schemes. The simulation results illustrate the superiority of our scheme for different channel conditions and different numbers of active users in the system. | ||||
Keywords | ||||
Scheduling; utility; IEEE802.16e; MIMO; cross layer; spatial multiplexing | ||||
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