Novel Approach for Evaluating Video Transmission using Combined Scalable Video Coding over Wireless Broadband Network

International Journal of Electrical and Computer Engineering (IJECE)
Vol. 8, No. 5, October 2018, pp. 3407~3416
ISSN: 2088-8708, DOI: 10.11591/ijece.v8i5.pp3407-3416  3407
Journal homepage: http://iaescore.com/journals/index.php/IJECE
Novel Approach for Evaluating Video Transmission using
Combined Scalable Video Coding over Wireless Broadband
Network
Kalvein Rantelobo1
, Kalamullah Ramli2
, Wirawan3
1
Department of Electrical Engineering, Universitas Nusa Cendana, Indonesia
2
Department of Electrical Engineering, Universitas Indonesia, Indonesia
3
Department of Electrical Engineering, Institut Teknologi Sepuluh Nopember, Indonesia
Article Info ABSTRACT
Article history:
Received Oct 18, 2017
Revised May 21, 2018
Accepted May 28, 2018
One of the main problems in video transmission is the bandwidth fluctuation
in wireless channel. Therefore, there is an urgent need to find an efficient
bandwidth utilization and method. This research utilizes the Combined
Scalable Video Coding (CSVC) which comes from Joint Scalable Video
Model (JSVM). In the combined scalable video coding, we implement
Coarse Grain Scalability (CGS) and Medium Grain Scalability (MGS). We
propose a new scheme in which it can be implemented on Network Simulator
II (NS-2) over wireless broadband network. The advantages of this new
scheme over the other schemes are more realistic and based on open source
program. The result shows that CSVC implementation on MGS mode
outperforms CGS mode.
Keyword:
CSVC
MGS
NS-2
Video transmission
Wireless broadband network Copyright © 2018 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Kalvein Rantelobo,
Departement of Electrical Engineering,
Universitas Nusa Cendana,
Jl. Adisucipto, Penfui, Kupang, NTT, Indonesia.
Email: rantelobo@ieee.org
1. INTRODUCTION
An increasing use of technology and the advanced development of information technology require a
large capacity of bandwidth and mobile services. These lead to the badwidth fluctuation particularly those
that use video transmission. Furthermore, wireless channel condition and bandwidth availability determine
the quality of video transmission. One of the attractive methods to solve the aforementioned problems in
video transmission over wireless channel is layering transmission method. In this method, bit streams are
scaled into a number of layer which consists of base and enhancement layers.. This is known as scalable
video method. This method is also implemented in multicast network where receivers only receive video
transmission as needed [1].
A systematic review of the vision of scalable video coding (SVC) over broadband is given in [1].
Moreover the application of the performances of SVC and its applications is shown in [2]-[4]. SVC is known
in three basics which are quality scalable (SNR scalable), temporal scalable, and spatial scalable. The
combination of these basics, known as Combined Scalable Video Coding (CSVC), is carried out by
combining the advantage of each one to transmit video when bit rate is prioritized and SNR scalable is used
when quality is preferred. The advantage of CSVC lies in the solution that it provides for video transmission
from various inputs in heterogeneous networks with multiple terminals having different capacities.
Most research used SVC with JSVM but not the combination of different scalable methods. This
will affect the quality of end to end system. The fore, in this research, we use the combination of SVC
(combined scalable video coding). This will be more flexible for adaptation to input characters, fluctuation of

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Int J Elec & Comp Eng, Vol. 8, No. 5, October 2018 : 3407 – 3416
3408
channel transmission, and multicast on network conditions. There are several researchers that proposed the
use of SCVS such as hybrid temporal-FGS (fine granular scalability) by Mihaela [5] and spatio-temporal by
Blaszak [6]. In this research, we extend the CSVC method proposed by Schwarz [7]. The current application
of SVC on broadband services has been proposed by Maodong Li [8]. There is a limited number of reported
works on evaluation of video transmission in wireless broadband networks. Thus far the research community
in the performance of evaluating video transmission on the network uses Evalvid [9] as popular scheme and
tools. Evalvid limitation which only supports MPEG standard has encouraged the scheme, new methods and
tools developed and refined by various parties. In [10], the proposed myEvalvid is seen to be capable to run
H.264, but have not been yet able to run SVC.
There are several schemes that utilize SVC as a public evaluation platform and based on open-
source program. They are, SVEF (Scalable Video coding Evaluation Framework) [11], EvalSVC (Evaluation
of SVC) [12], and myEvalSVC [13]. In [11], the proposed SVEF schemes and tools are built on open-source
basis. SVEF is a mixed online/offline open-source framework devised to evaluate the performance of H.264
SVC video streaming. SVEF is written in C and Python and also will be released under the GNU General
Public License. SVEF has been able to evaluate basic SVC. However, it is still incomplete and inadequate in
analyzing complete SVC. In addition, SVEF construction may not easy since it requires specialized skills.
EvalSVC method and scheme proposed in [12] are publicly available and free. However, EvalSVC does not
clearly indicate how to handle missing or corrupted packets. It is then updated and extended in [13] with
myEvalSVC which is capable to run H.264 AVC and SVC in general. Nevertheless, this scheme has not been
explored and developed to the maximum so that the package has not been able to evaluate the CSVC. To
overcome those limitations, we propose a new scheme in this paper. The scheme provides a tool-set to
evaluate and analyze CSVC in a wireless broadband network on an end-to-end system.
This scheme is developed and distributed on an open-source platform to enable researcher and
developer to use, analyze, and enrich it according to their requirements and needs [14]. To obtain the
comprehensive analysis, the combination of scalable method is needed. However, to the best of our
knowledge, there is no research on evaluation SVC using the combination of scalable method, which is a key
in evaluation the quality of video transmission over broadband network. In this research, we compare the
MGS and CGS, which is an extension of our previous [15], [16].
The scheme of framework can evaluate performance of average Peak Signal-to- Noise Ratio
(PSNR), coding efficiency, performance of metrics systems as end-to-end delay, and queuing delay of the
packets in the network. Furthermore, the scheme is simpler than other schemes in prior work which used to
evaluate of video transmission over wireless broadband network (it will be explained in more detail in the
next section of this paper). The proposed scheme is a promising approach for evaluating video transmission
over wireless broadband services in the future. We believe that this new scheme will facilitate and simplify
the evaluation and exploitation of video packets over wireless broadband network which is expected to
improve research in this field.
The rest of the paper is organized as follows: Section 2 presents the CSVC evaluation framework,
CSVC method, MGS and CGS modes, and Network Simulator over wireless broadband network. In
Section 3, we describe the experimental results and discussion, and finally we present conclusion and future
work.
2. THE COMBINED SCALABLE VIDEO CODING (CSVC) EVALUATION FRAMEWORK
2.1. Combined scalable video coding (CSVC)
SVC is a part of H.264/MPEG-4 part 10 AVC (Advanced Video Coding), or H.264/AVC [1]-[3].
H.262 and MPEG-2, followed by H.263+ and MPEG-4. Since January 2005, MPEG and VCEG have been
joined together in JVT to carry out completion of the H.264/AVC amendment as an official standard [2].
Until now, H.264/AVC standard is still in amendment, and it is a cooperative work of many parties to
establish Multiview Video Coding and High Efficiency Video Coding (HEVC) or H.265.
Scalability proposed for the first time is to reduce packet (cell) loss in ATM networks [1]. It divides
one bitstream into several sub-bitstreams or layers according to network state, which can offer efficiency and
superior quality video coding on broadband services compared to other video coding standards. It created two
groups of layers which are base and enhancement layers. The base layer contains vital information whereas
the enhancement layer comprises residual information to enhance the quality of video sequences. A SVC
system consists of encoder and decoder is depicted in Figure 1. Within data transmission process, base-layer
containing vital information still makes it through in case of congestion in transmission channel. Figure 1
shows the three types of scalability methods: SNR (Signal-to-Noise Ratio) Scalability, Spatial Scalability,
and Temporal Scalability. In addition, there is the other scalability method that combines these three
methods. When the inter layer resolution is changed, the spatial scalable will be dominant. When the quality

Int J Elec & Comp Eng ISSN: 2088-8708 
Novel Approach for Evaluating Video Transmission using Combined … (Kalvein Rantelobo)
3409
of video is changed, SNR scalable is dominant. When the bit rate is changed, the temporal scalability is
dominant. The combination of those three is likely to due to varying in sequences characteristics, fluctuated
network condition and multi terminals [1], [5], [7]. This research utilizes three layers of combined scalable:
one base layer and two enhancement layers as given in Figure 1.
Scalable
bitstream
Original
video
Output
Scalable
bitstream
Input
LayeredEncoder
Base
Layer
Enhancement
Layer
+
+
Layer 1
Layer 2
Layer 3
Multiplex
+ Layer n
Output
Video
Rekonstruksi
Input
Demultiplex
Base
Layer
Enhancement
Layer
+
+
Layer 1
Layer 2
Layer 3
+ Layer n
(a) Sistem Encoder
(b) Sistem Decoder
-
-
-
...
......
...
Figure 1. Scalable video coding systems
2.2. MGS and CGS
In this work, we focus on the quality scalability in H.264 SVC. Layer of quality scalable has the
same spatio-temporal resolution but different fidelity. The H.264 SVC extension supports two quality
scalable modes namely coarse grain scalability (CGS) and medium grain scalability (MGS) [2], [17]. Each
spatial layer is referred to as CGS or MGS. CGS can be viewed as a special case of spatial scalability in
H.264 SVC. In similar encoding mechanisms, CGS is employed but the spatial resolution will remain
constant. More specifically, similar to spatial scalability, CGS employs inter-layer prediction mechanisms,
such as prediction of macro block modes and associated motion parameters and prediction of the residue
signal. CGS differs from spatial scalability where up-sampling operations are not performed. In CGS, the
residual texture signal in the enhancement layer is re-quantized with a smaller quantization step size than the
preceding CGS layer. SVC supports up to eight CGS layers fit to eight quality extraction points, namely one
base layer and up to seven enhancement layers. If quality scalability is using CGS, switching different CGS
layers must be done at the defined point. However, if the quality scalability is using MGS, switching different
MGS layer can be done in any access unit. While CGS provides quality scalability by dropping complete
enhancement layers, MGS provides a better granularity level of quality scalability by partitioning a given
enhancement layer into several MGS layers. Individual MGS layers can then be dropped for quality (and bit
rate) adaptation. With the MGS concept, any enhancement layer NAL (Network Abstraction Layer) unit can
be discarded from a quality scalable bit stream.
2.3. Network simulator II (NS-2) for evaluation transmission video
The difficulties on research in video mainly arise from lack of tools and testing system environment
(test bed) which can be accommodated by using network simulator. This paper describes about how to
analyze video transmission using testbed on Network Simulator II (Version 2), widely known as NS-2 [18]. It
is an event-driven tool which is useful for studying the dynamics of communication network. This test bed
has simplicity in supporting researches on video transmission field [19]. NS-2 is very helpful for researchers
in developing their works on many fields that constraint by laboratory tools or experiment related to
networks. Video transmission over wireless network requires tools and complex technical environment. In
this work, we have adopted and modified scenario networks in NS-2 (WLAN 802.11e) [20] from
C. H. Ke [13].
3. SYSTEM MODEL OF EVALUATION FRAMEWORK
The proposed evaluation framework scheme is shown as in Figure 3 where it shows the simulation
of bit rate; PSNR (Peak Signal-to-Noise Ratio); end-to-end delay; and queue length of packets. To analyze

 ISSN: 2088-8708
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the outputs, we use MFC YUV viewer software and VLC media player. Source code of JSVM version 9.18
[21], runs on Linux Fedora 16. The main component of this framework evaluating as show in Figure 3 are as
follows in Table 2. External tools from SVEF [11] adopted in this scheme as in Figure 2.
Figure 2. Novel approach of scheme for evaluating video transmission using CSVC with NS-2
4. RESULTS AND ANALYSIS
In this research, we propose a novel scheme, where CSVC is implemented over wireless broadband
network WLAN IEEE 802.11e on NS-2 [17]. Figure 2 shows research scheme for evaluation framework
overall. In this research, we use CGS and MGS modes of JSVM. In the experiment we use JSVM version
9.18 [21] and NS-2 version 2.29. Computer simulations are done to verify the performance of this new
scheme. The parameters and components/tools of the scheme are given in Table 1.
Table 1. Parameters and Components/Tools in the evaluation frameworks
Parameters and Components/Tools Description
Input and output video sequences
Encoder and Decoder od CSVC
BitStream Extractor CSVC
NS-2
SVEF
PSNR Analyzer
Spatial Scalable
GOP (Group of Picture)
QP (Quantization Parameter)
Motion Search Range
Wireless Standars
Data rate
OS (Operating Systems)
Stefan (90 frames);
Bus (150 frames)
Foreman (300 frames);
City (300 frames)
Using JSVM version 9.18 [21]
Part of JSVM
Version 2.29 [18]
Version 1.4 and external tool [11]
External tool and optional
QCIF; CIF
4 frames
18; 20; 24; 32
± 32
WLAN 802.11e [20]
1 Mbps
Linux Fedora 16
4.1. Video quality parameters
Testing and analysis of video input are Stefan sequences, Bus sequences, Foreman sequences, and
City sequences. We use the Peak Signal-to-Noise Ratio (PSNR) to measure the quality between original
sequence and reconstructed sequence. This metric employed is the Mean Squared Error (MSE) given by
(1)
and PSNR is defined as
 
MSE
PSNR
n 2
10
12
log10

 (2)

3411
where W is number of pixel/row, H is number of row/frame, f(x; y) is luminance intensity of pixel in the
original frame, g(x; y) is luminance intensity of pixel in the reconstructed frame, and n is number of bits per
pixel. In analyzing PSNR, we use the parameters of Y-PSNR (component of the video luminance) that are
commonly used in the analysis of video transmission. Calculation and analysis of bit rate uses equation is
given by
(3)
where Br is bit rate, Nb is total bit, Nf is number of frame, and Mf is mean frame rate. Input video sequence
has been analyzed by quantization parameters (QP) 20, 24, 28, and 32. In the calculation and analysis of end-
to-end delay and queue system, used equations such as packet transmission time given by
(4)
where Tpacket is packet transmission time, Spacket is packet size, and Btr is bandwidth transmission. The
analysis of the total delay is including of the propagation delay on the network.
4.2. Performance evaluation of framework
The main parameters used to evaluate framework performance are described as follows:
4.2.1. Bitrate and efficiency coding
In this research, the coding efficiency of encoder CSVC from Stefan sequence, Bus sequences,
Foreman sequences, and City sequences are analyzed. This functions as an input as given in Figure 3. We
follow JSVM algorithm to operate encoding. The decoding output of CSVC is given in Fig 4. It shows that
on layer 3, MGS mode gains PSNR 4 dB above CGS mode. Furthermore, it can be seen that there is no
significant difference. Whereas, layer 1 there is 2.4 dB to 3.1 dB differences. This study utilize two modes:
CGS and MGS in which each mode uses three layers of CSVC. It can be seen from layer 3 that MGS mode
gains Y-PSNR about 2.2 dB above CGS mode at bit rate 1700 kbps. On the other hand, at Y-PSNR 42 dB,
MGS mode has a gap about 500 kbps above CGS mode. On layer 2, it can be seen that there is not significant
different. Whereas, it can be seen from layer 1 that there is 2.6 dB to 3.2 dB differences. There is a significant
gap between CGS and MGS as shown in layer 3. In the case of Stefan sequence (Figure 3(a)) and BUS
sequence (Figure 3(b)) as input, starts from 1000 kbps (1 Mbps) bitrate has shown the gap, where the gap is
2.2 dB on 3700 kbps bitrate. In case of Foreman sequence (Figure 3(c)) and City sequence (Figure 3(d)) as
input, from 800 kbps bitrate shows the gap, up to about 2700 kbps bitrate shows around 1.2 dB gap. In
contrast to the layer 1 and layer 2, it is not seen significant gap between CGS and MGS, the Stefan sequence
and the BUS sequence as input below 1 Mbps while Foreman sequence and City sequence as input below
800 kbs. We briefly note that MGS overcome PSNR performance to CGS at the same bitrate. Increasing
number of frame sequence to be transmitted will cause Y-PSNR to have decreasing gap. We briefly note that
MGS overcome PSNR performance to CGS at the same bitrate. Increasing the frame sequence to be
transmitted causes Y-PSNR gap decreased.

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Figure 3. Performance of coding efficiency component of encoding
4.2.2. PSNR as performance framework overall
Figure 4 Stefan sequence shows that the average Y-PSNR as output of the new scheme, where CGS
has value of 16.8 dB, and MGS 20 dB. It is around 3.3 dB gap. In Figure 4(b) on Bus sequence, where CGS
has value of 11.9 dB, and MGS 14.6 dB. It has around 2.8 dB gap. In Figure 4(c) Foreman sequence, where
CGS has value of 23.3 dB, and MGS 25.7 dB. It has around 2.45 dB gap. In Figure 4(d) City sequence, it
shows that CGS has value of 23.5 dB, and MGS has the value of 24.8 dB. It has around 1.4 dB gap. We can
conclude that MGS is better than CGS of approximately 1.4 dB up to 3.1 dB. However from the ITU
reference [22], it showed that the results mentioned above still exist under the fair category (PSNR below
25 dB). The only worth more than 25 dB is MGS mode on the input of Foreman sequence. This shows that
the error-resilience and the error-concealment has not running well where packet/frame error is still a lot
going on. NS-2 environment affects the results, so that the development it is a challenge for the future
research.

3413
Figure 4. Performance of PSNR metrics of the proposed scheme
4.2.3. End-to-end delay
Parameter of end-to-end delay depends on the characteristics of the input sequence to be
transmitted. CGS is relatively more stable as input Stefan sequence (as show Figure 5(a)) and the Bus
sequence (as show Figure 5(b)). It shows that the packet delivery is delayed to 100 packets in 0.8 seconds,
while in MGS, end-to-end delays is increasing in linear. On the input of Foreman sequence (as show
Figure 5(c)) and the City sequence (as show Figure 5(d)), CGS has an average delay of about 0.7 seconds,
while MGS has an average delay of about 0.2 seconds. It indicates that MGS has less end-to-end delay and
better than CGS. The more packets transmitted in the network, the gap of delay occurs between CGS and
MGS is higher.
4.2.4. Queue length systems
In this study we limit the system to the maximum packet queue of 50 packets in the buffer due to the
computational efficiency issues. We observe from Figure 6 that the Foreman sequence (Figure 6(a)) and City
sequence (Figure 6(b)) show that CGS has less time than MGS. However, in Foreman sequence (Figure 6(c))
and City sequence (Figure 6(d)) as the inputs which have more number of frames show that queuing length of
MGS is less than CGS. Increasing number of frames sequence in transmission will cause queuing of packets
takes longer time. In summary, we conclude that CGS and MGS mode on video transmission over wireless
broadband network can be implemented on NS-2 well. The use of MGS mode is more satisfactory compared
to CGS mode.

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Figure 5. Performance metrics systems on the end-to-end delay
Figure 6. Performance metrics systems on the queue length packets

3415
5. CONCLUSION
In this research, we have proposed a novel approach for platform evaluation of video transmission
based on the CSVC over wireless broadband network (WLAN IEEE 802.11e), simulated by NS-2.
Furthermore, we also have investigated the effects of the application of MGS and CGS modes on
performance of this system. The application of MGS mode on CSVC increases the performance of the
system in comparison to CGS mode. In general, our scheme is simple and easily implemented for evaluating
video transmission over wireless broadband network.
The future work will focus on providing CSI (Channel State Information) using limited feedback
method for new scheme on adaptive system for video transmission over wireless broadband network services
such WiMAX or LTE. Moreover, we will extend and develop our future results by implementing NS-3 and
then compare the results to the real experiment.
ACKNOWLEDGEMENTS
The research is supported through Post-Doctoral Grants (Hibah Pascadoktor) by Indonesian
Ministry of Research and Higher Education (under Grant No. 223/UN15.19/LT/2017). We are very grateful
to Mr. Chih-Heng Ke for discussion and development of NS-2 simulation program; Prof Hua An-Zhao for
support; Lab. Teknik Elektro FST Undana; Communication Digital Lab. UI; Mr. Dewa Made Wiharta and
Mr. Meksianis Ndii for fruitful discussion.
REFERENCES
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[18] Network Simulator II (NS-2), [Online]. Available: http://www.isi.edu/nsnam/ns
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BIOGRAPHIES OF AUTHORS
Kalvein Rantelobo received the B.E. degree from Hasanuddin University, Makassar, Indonesia in
1996; M. Eng. degree from Institut Teknologi Bandung (ITB), Bandung, Indonesia in 2003; and
the Dr. Eng. degree from Electrical Engineering Dept. at Institut Teknologi Sepuluh Nopember
(ITS), Surabaya, Indonesia in 2014. Since 1998 he has been with Electrical Engineering
Department Universitas Nusa Cendana as lecturer. His research areas include video transmission
over mobile broadband services, video coding and Multimedia Wireless Sensor Networks. He is a
member of IEEE.
Kalamullah Ramli is a Professor on Computer Engineering since July 1, 2009. He finished his
Masters in Telecommunication Engineering at University of Wollongong, NSW, Australia, in
1997. He then continued his Doktorarbeit on Computer Networks in year 2000 at Universitaet
Duisburg-Essen, NRW, Germany, and obtained his Dr.-Ing. in year 2003. He has been with
Universitas Indonesia (UI) since 1994. His research interests are Pervasive and Embedded System;
Intelligent Transportation System; Network Modeling and Protocol Management; and Strategic
ICT Policy and Regulation.
Wirawan received the B.E. degree in telecommunication engineering from Institut Teknologi
Sepuluh Nopember (ITS), Surabaya, Indonesia, in 1987, the DEA in signal and image processing
from Ecole Supérieure en Sciences Informatiques, Sophia Antipolis, and the Dr. degree in image
processing from Telecom ParisTech (previously Ecole Nationale Supérieure des
Télécommunications), Paris, France, in 1996 and 2003, respectively. Since 1989 he has been with
ITS as lecturer in the Electrical Engineering Department. His research interest lie in the general
area of image and video signal processing for mobile communications, and recently focuses more
on underwater acoustic communication and networking and on various aspects of wireless sensor
networks. He is a member of IEEE

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