Analysis of QOS mechanism for multiple multicast streams of IPv6-based IPTV network
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Date
2009-06
Authors
Trisnawan, Primantara Hari
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Abstract
A convergence between IP and TV known as IPTV gams popularity.
Unfortunately, IPTV has limitation, such as using an almost "fully occupied" IPv4,
providing private network, and mostly not considering "quality of service". With the
availability of higher speed Internet connections and the implementation of newer
protocol IPv6 with advanced features, IPTV will become broadly accessible with
better view. IPv6 has a feature of Quality of Service through the use of its attributes
of traffic class or flowlable, especially for guaranteeing bandwidth and latency for
multicast multimedia streaming.
Existing implementation of current IPv6 attributes is only to differentiate
multicast multimedia stream and non multicast one, or providing the same Quality of
Service on a single multicast stream along its deliveries regardless number of users.
Problem arose is about sending mUltiple multicast streams on allocated bandwidth
capacity and different number of their users under routers. Therefore, it needs a
quality of service which operates on priority based for multiple multicast streams.
The more users joining a multicast stream, the higher priority for the multicast
stream to be forwarded. In this thesis, a new QoS mechanism using IPv6 protocol is
proposed as well as QoS structure as IPv6 extension header. QoS structure is an IPv6
extension header which is attached into a multicast stream and brings QoS priority
values, whereas QoS mechanism operates in routers to determine whethe
incoming multicast datagram is forwarded or not by considering its QoS priority
values (in QoS structure).
Through a senes of experiments usmg newly available NS3 network
simulator, the performance of IPv6 based IPTV could be evaluated. Two different
topologies have been used with the following parameters: number of users and
bandwidth capacity (including the influence of non multicast stream traffic). The
topologies have been evaluated with five mathematical functions models to represent
number of users with regards to QoS priority level. The experiments have used three
criteria levels (0%, 70% and 100% of routers' queue size) which considers about
when queue probability is implemented in QoS mechanism.
The experimental results have good QoS performances with three of five
mathematical function models (constant, negative linear and negative exponential),
and criteria levels of 70% and 100%. With these three models and criteria levels,
QoS measurements show increasing throughput, decreasing delay and low jitter. It
means that for higher number of subscribers with few numbers of multicast streams
(channels) the QoS performances are better than the other two mathematical function
models. However, if non multicast traffics are considered, the three models are
constant, positive linear and negative linear, and with criteria level 70% and 100%.
Description
Keywords
IPv6 has a feature of Quality of Service through the use of , its attributes of traffic class or flowlable