Browsing by Author "Liang, Ching-Feng"

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ITRI-WiMAXT: A WiMAX conformance testing tool
(2010-02-01)
Lee, Hsin-Yi
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Lin, Yi-Bing
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Liang, Ching-Feng
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Huang, Shiang-Ming
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資訊工程學系
The WiMAX Forum certifies and promotes the compatibility and interoperability of broadband wireless products where many testcases need to be developed for WiMAX procedures. In this paper, we develop a conformance test tool called ITRI-WiMAXT based on the TTCN-3 specifications. Then we show how WiMAX procedures are tested in ITRI-WiMAXT. Based on ITRI-WiMAXT, we have proposed several test procedures accepted by the WiMAX Forum. Copyright (C) 2009 John Wiley & Sons, Ltd.
Method and apparatus for telephone routing between PTN and PSTN
(2007-05-31)
Chang, Ming-Feng
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Lin, Yi-Bing
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Liang, Ching-Feng
Disclosed is a method and apparatus applicable to an interface between PSTN and PTN for telephone routing. The interface includes a branch switch, a key system, a network branch switch, and media gateway, etc. The telephone routing method and apparatus of the present invention creates, maintains, and utilizes a call-back routing table to enable a specified PSTN user to call the callback external leased line to reach a specified PTN user in a one-stage dialing manner. The process of one-stage dialing includes PTN call origination to PSTN, PSTN call origination to PTN, and callback tag insertion in the call-back routing table. The call-back routing table consists of a plurality of call-back tags. Each call-back tag consists of at least a data triple, i.e. PTN user identifier, PSTN called party telephone number, and callback leased line identifier.
NTP-SIOT: A test tool for advanced mobile services
(2007-01-01)
Lin, Yi-Bing
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Liang, Ching-Feng
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Chen, Kuei-Hui
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Liao, Hsin-Yu
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交大名義發表
This article describes system design for an Open Mobile Alliance Service Interoperability Test Platform called NTP-SIOT. Based on the TTCN-3 specifications, we show how 4G mobile applications such as OMA multimedia messaging service can be tested in this platform.
Reducing Call Routing Cost for Femtocells
(2010-07-01)
Lin, Yi-Bing
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Gan, Chai-Hien
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Liang, Ching-Feng
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資訊工程學系
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交大工研院聯合研發中心
Femtocell is an effective solution to improve indoor coverage for cellular networks, where short-range and low-power Base Stations (BSs) called Femto BSs are deployed in small areas (e. g., buildings). We propose the Femto Private Branch Exchange (FPBX) to concentrate the traffic of the Femto BSs in a specific area, such as a campus or an enterprise with central or distributed locations. Through the FPBX, a normal cellular call between two Femto users can be replaced by a low-cost extension call. Therefore, the call routing cost can be significantly reduced. In this approach, the existing mobile network nodes are not modified. We analytically analyze the call routing performance for the FPBX approach, and develop simulation experiments to validate against the analytic model. Our study indicates that the FPBX approach can effectively reduces the call setup costs and the voice trunk costs among Femto users by slightly increasing the normal cellular call setup costs.