Browsing by Author "Hsu, Teng-Wei"

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Facilitating the network entry and link establishment processes of IEEE 802.16 mesh networks
(2007)
Wang, Shie-Yuan
;
Lin, Chih-Che
;
Fang, Ku-Han
;
Hsu, Teng-Wei
;
資訊工程學系
The IEEE 802.16 standard is a promising next-generation broadband technology. It contains two operational modes - PMP and mesh. The PMP mode defines one-hop communication between a base station (BS) and a subscriber station (SS), while the mesh mode allows traffic to be directly exchanged and forwarded among neighboring SSs. In the mesh mode, network initialization is composed of the network entry (NENT) and link establishment (LinkEst) processes. In this paper, we identify that the NENT process is prone to fail in dense networks and propose a solution to remedy this problem. Besides, we propose an extension to the LinkEst process to improve its efficiency. Both proposals are compatible with the current standard. Our simulation results show that our solution to the NENT process can on average increase the success rate by 22.5%, and our extension to the LinkEst process can on average speed up the process by 2.57 times.
Improving the performances of distributed coordinated scheduling in IEEE 802.16 mesh networks
(2008-07-01)
Wang, Shie-Yuan
;
Lin, Chih-Che
;
Chu, Han-Wei
;
Hsu, Teng-Wei
;
Fang, Ku-Han
The IEEE 802.16 mesh network is a promising next-generation wireless backbone network. In such a network, setting the holdoff time for nodes is essential to achieving good performances of medium-access-control-layer scheduling. In this paper, we propose a two-phase holdoff time setting scheme to improve network utilization. Both static and dynamic approaches of this scheme are proposed, and their performances are compared against those of the original schemes. Our simulation results show that both approaches significantly increase the utilization of the control-plane bandwidth and decrease the time required to establish data schedules. In addition, both approaches provide efficient and fair scheduling for IEEE 802.16 mesh networks and generate good application performances.
On the performances of IEEE 802.16(d) mesh CDS-mode networks using Single-Switched-Beam Antennas
(2012-03-16)
Lin, Chih-Che
;
Wang, Shie-Yuan
;
Hsu, Teng-Wei
;
資訊工程學系
;
Department of Computer Science
The IEEE 802.16(d) mesh coordinated distributed scheduling (CDS) mode is a novel technology for future fixed wireless backbone networks and designed for the use of omnidirectional antennas. The use of Single-Switched-Beam Antennas (SSBAs) may have great potential to increase network capacity due to the antenna directivity. However, a network designed for omnidirectional antennas usually cannot operate well or achieve good performance with the presence of antenna directivity. In this paper, we review the designs of the IEEE 802.16 mesh CDS-mode network, study the issues of this network with the use of Single-Switched-Beam Antennas (SSBAs), and propose a complete solution to solve these issues. The performances of our proposed scheme is evaluated using simulations. The simulation results show that our proposed scheme can effectively solve the issues of using SSBAs in the IEEE 802.16 mesh CDS-mode network and greatly increase its network capacity. (C) 2011 Elsevier B.V. All rights reserved.