Browsing by Author "Su, Jiun-Jang"

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An end-to-end channel allocation scheme for a wireless mesh network
(2014-12-01)
Tsao, Shiao-Li
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Su, Jiun-Jang
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Huang, Kuei-Li
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Shih, Yung-Chien
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Tseng, Chien-Chao
Co-channel interference seriously influences the throughput of a wireless mesh network. This study proposes an end-to-end channel allocation scheme (EECAS) that extends the radio-frequency-slot method to minimize co-channel interference. The EECAS first separates the transmission and reception of packets into two channels. This scheme can then classify the state of each radio-frequency-slot as transmitting, receiving, interfered, free, or parity. A node that initiates a communication session with a quality of service requirement can propagate a channel allocation request along the communication path to the destination. By checking the channel state, the EECAS can determine feasible radio-frequency-slot allocations for the end-to-end path. The simulation results in this study demonstrate that the proposed approach performs well in intra-mesh and inter-mesh communications, and it outperforms previous channel allocation schemes in end-to-end throughput. Copyright (c) 2013 John Wiley & Sons, Ltd.
Crossover Node Discovery for IEEE 802.11s Wireless Mesh Networks
(2013-01-01)
Yen, Li-Hsing
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Su, Jiun-Jang
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Huang, Kuei-Li
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Tseng, Chien-Chao
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Liao, Kuan-Ming
Crossover nodes have been utilized to achieve smooth handoffs for micro mobility management schemes. IEEE 802.11s supports proxy-based frame delivery services for mobile hosts roaming within a wireless mesh network (WMN). Discovering crossover node for mobile hosts in 802.11s WMNs, however, faces several challenges due to intrinsic properties of mesh networks. This paper identifies these challenges and proposes a scheme suitable for crossover node discovery under 802.11s WMNs. This scheme is characterized by source-oriented, MAP-centric, and per-source. It can be performed off-line with the derived results cached for on-line retrievals during handoffs. Simulation results show that the proposed scheme can reduce packet losses due to handoffs, and confirm the necessity of the source-oriented principle.