Journal of Information Technology & Software Engineering
Open Access
ISSN: 2165- 7866
+44 1300 500008
ISSN: 2165- 7866
+44 1300 500008
Tsang-Ling Sheu
Scientific Tracks Abstracts: J Inform Tech Soft Engg
Multicast is an effective mechanism to substantially save network bandwidth while transmitting real-time video streams in
a wireless mobile communication network (such as 3G/4G). However, today it lacks a packet retransmission scheme for
real-time video multicasting in mobile communication networks. The last hop of a mobile communication network is defined
as the hop between a base station (BS)/gateway and a mobile station (MS). Packet errors happen very easily in the last hop
because wireless channels in a mobile communication network are error-prone. As a result, packet errors in the last hop may
bring a critical deterioration of video quality at MS. Besides, an end-to-end retransmission scheme, such as TCP, cannot meet
the strict delay constraints of a real-time video stream. Hence, in this paper, we propose a retransmission scheme to improve
the quality of video multicasting in the last-hop of a mobile communication network. The proposed retransmission scheme
requires MS in a multicast group to feedback ARQ (Automatic Repeated Request) messages to BS/Gateway. The proposed
retransmission scheme is invoked under three considerations: The extra bandwidth cost for retransmitting the erroneous
blocks, the retransmission delay, and the acceptable delay constraints at MS. NS-3 simulation is performed to demonstrate
the superiority of the proposed retransmission scheme. From simulation, we reveal how well the retransmission scheme can
reconstruct the quality of a multicast video stream at MS. Furthermore, the extra bandwidth cost for retransmitting erroneous
blocks is investigated.
Tsang-Ling Sheu received the PhD degree in Computer Engineering from the Department of Electrical and Computer Engineering, Penn State University, University
Park, Pennsylvania, USA, in 1989. From Sept. 1989 to July 1995, he worked with IBM Corporation at Research Triangle Park, North Carolina, USA. In Aug.
1995, he became an Associate Professor, and was promoted to full Professor in Jan. 2006 at the Dept. of Electrical Engineering, National Sun Yat-sen University,
Kaohsiung, Taiwan. His research interests include wireless networks, mobile communications, and multimedia networking. He was the recipient of the 1990 IBM
outstanding paper award. He is a senior member of the IEEE, and the IEEE Communications Society.