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Adaptive Rate Control Scheme for Improving Quality of Multimedia
in Broadband Wireless Networks
Dooyeol Yoon, Dongchil Kim and Kwangsue Chung
Department of Communications Engineering, Kwangwoon University, Seoul, Korea
Keywords: Quality Adaptation Scheme, Video Streaming, Rate Control.
Abstract: In order to improve quality of streaming services in broadband wireless networks, many researches are in
progress. However, existing schemes do not guarantee a user perceived quality, because most of these
schemes do not consider both wireless channel states and video characteristics. To cope with these problems,
this paper proposes a NB-RC (Network and Buffer-aware Rate Control) scheme. The proposed scheme
adjusts the video transmission rate according to the wireless channel states. It also controls the video quality
based on buffer occupancy of clients. Through the simulation results, we prove that our scheme improves
the media quality.
1 INTRODUCTION
Due to the explosive growth of the broadband
wireless network technologies, there has been a
significantly increasing demand for multimedia
streaming applications such as mobile IPTV (Park
and Jeong, 2009). Recent advances in high-speed
networks have made it feasible to provide high
quality of video streaming. Among the advanced
wireless standards, LTE (Long Term Evolution) is
an emerging wireless communication system that
provides high-data rate as well as long-range
converage. However, multimedia streaming service
in a wireless communication network environment is
largely affected by various network characteristics,
such as limited channel bandwidth and variant
transmission rate. The channel bandwidth variation
causes the network congestion when the video
transmission rate exceeds the channel bandwidth.
To solve these problems, several methods for
wireless video streaming have been proposed. An
end-to-end QoS-based adaptation scheme called
AWMECN (Application-level Wireless Multilevel
ECN) is suggested in heterogeneous wireless
networks by overcoming the congestion/loss mistake
problems (Karimi et al., 2010). A probing-based
channel adaptive video streaming method is
proposed to adjust the transmission rate to the
varying throughput of wireless 3G network (Kim et
al., 2006). Also, a WMSTFP (Wireless Multimedia
Streaming TCP-Friendly transmission control
Protocol) is proposed to effectively differentiate
erroneous packet losses from congestive losses and
to filter out the abnormal round-trip time values
caused by the highly varying wireless channel states
(Yang et al., 2004). A new single-rate multicast
congestion control scheme called ASMP (Adaptive
Smooth Multicast Protocol) for multimedia
transmission over best-effort networks is proposed
(Bouras et al., 2010). However, all of theses
schemes doesn’t consider the buffer states of a client
and require the bandiwdth estimation of wireless
network.
To cope with these problems, a new adaptive
streaming scheme has been proposed (Koo and
Chung, 2010). This scheme called MARC (Mobile-
aware Adaptive Rate Control), which adjusts the
quality of bit-stream and transmission rate of video
streaming based on the wireless channel states and
network states. However, the MARC scheme is
sensitive to packet loss rate. It could cause the
oscillation of transmission rate.
In this paper, we propose a NB-RC (Network
and Buffer-aware Rate Control) scheme for
improving the video quality in multimedia streaming
services. The NB-RC scheme considers not only the
wireless channel states but also the buffer occupancy
of clients. This paper shows that the proposed NB-
RC scheme can significantly improve the media
quality. The rest of the paper is organized as follows.
In the next section, we present the NB-RC scheme
for improving quality of multimedia. Simulation
7
Yoon D., Kim D. and Chung K..
Adaptive Rate Control Scheme for Improving Quality of Multimedia in Broadband Wireless Networks.
DOI: 10.5220/0004020400070011
In Proceedings of the International Conference on Signal Processing and Multimedia Applications and Wireless Information Networks and Systems
(SIGMAP-2012), pages 7-11
ISBN: 978-989-8565-25-9
Copyright
c
2012 SCITEPRESS (Science and Technology Publications, Lda.)