Browsing by Author "Luo, Chao-Liang"

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Cost Analysis of Short Message Retransmissions
(2010-02-01)
Sou, Sok-Ian
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Lin, Yi-Bing
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Luo, Chao-Liang
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資訊工程學系
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Department of Computer Science
Short Message Service (SMS) is the most popular mobile data service today. In Taiwan, a subscriber sends more than 200 short messages per year on average. The huge demand for SMS significantly increases network traffic, and it is essential that mobile operators should provide efficient SMS delivery mechanism. In this paper, we study the short message retransmission policies and derive some facts about these policies. Then, we propose an analytic model to investigate the short message retransmission performance. The analytic model is validated against simulation experiments. We also collect SMS statistics from a commercial mobile telecommunications network. Our study indicates that the performance trends for the analytic/simulation models and the measured data are consistent.
Deriving the distributions for the numbers of short message arrivals
(2014-03-01)
Hung, Hui-Nien
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Lin, Yi-Bing
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Luo, Chao-Liang
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統計學研究所
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資訊工程學系
In the broadband era, narrowband short message service (SMS) is still the most popular wireless data service. Many studies have been conducted to investigate the performance of SMS based on the arrival rates of short messages. From Chunghwa Telecom's commercial SMS call data records, we observed that even if the SMS arrival rates are the same, the distributions for the number of SMS arrivals per half hour are quite different for various observed days. We further identify that for the SMS traffic in a specific day, there are non-burst and burst periods. This paper investigates the SMS behaviors on weekdays, weekends, and holidays (specifically, new years' days and eves). With the assistance of kernel-based fitting method, we derive the SMS arrival number distributions of various traffic types and observed days. Our approach fits each SMS arrival number distribution by three cubic polynomial functions that can accurately capture the SMS behaviors. On the basis of the SMS arrival number distributions derived from our model, the mobile operators have better understanding about the volumes of short messages in different times and days, which can be used to design more flexible short message charging rates. Copyright (c) 2012 John Wiley & Sons, Ltd.
Transmission Policies for Multi-Segment Short Messages
(2016-07)
Lin, Yi-Bing
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Sou, Sok-Ian
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Luo, Chao-Liang
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資訊工程學系
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Department of Computer Science
The performance of single-segment short messaging service (SMS) (i.e., the message sizes are smaller than 140 octets) has been intensively investigated. On the other hand, multisegment messages (with sizes larger than 140 octets) are seldom evaluated in the literature. This paper proposes analytical models to study two transmission policies for multisegment short messages. We show how to improve the performance of multisegment short message delivery by selecting appropriate transmission parameters: the retransmission interval and the maximum number of transmissions. The proposed models are validated by measured data collected from the largest telecom operator in Taiwan over a period of six months. We provide useful guidelines to configure parameters for SMS transmission policy. Numerical examples showed that the performance can be improved by over 20% in terms of successful delivery ratio.