Browsing by Author "Rao, Herman Chung-Hwa"

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IP2P: A PEER-TO-PEER SYSTEM FOR MOBILE DEVICES
(2009-04-01)
Huang-Fu, Chien-Chun
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Lin, Yi-Bing
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Rao, Herman Chung-Hwa
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資訊工程學系
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Department of Computer Science
Peer-to-peer communications is a major trend in wireless Internet. In a P2P system, the calling peer must identify the network address of the called peer before establishing a P2P connection. This article proposes iP2P, a hybrid P2P system for mobile devices. iP2P utilizes the short message service as the control protocol to identify the address of the called peer. Our approach provides an efficient identification mechanism without the requirement for the maintenance of a centralized registrar server in a hybrid P2P system. We also show how iP2P can integrate effectively with the existing Network Address Translation traversal mechanisms to solve the private IP address issue.
VOICE/VIDEO QUALITY MEASUREMENT FOR LTE SERVICES
(2018-08-01)
Sung, Yingrong Coral
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Ho, Yung-Sheng
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Lin, Yi-Bing
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Chen, Jyh-Cheng
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Rao, Herman Chung-Hwa
LTE is a broadband wireless communication standard with the core network technology including voice service, which will be enhanced and evolved into 5G. In this article, we elaborate on performance issues of VoLTE and ViLTE. We investigate VoLTE voice quality with measurement experiments performed in the ITRI VoLTE testing environment. We also present the multimode and multiband interworking ViLTE call with a trial in a FET commercial mobile network. Our study provides references for the operators to measure the quality of VoLTE and ViLTE services.