27-03-2012, 11:58 AM
New Generation Network: Beyond the Internet and NGN
7.pdf (Size: 243.17 KB / Downloads: 60)
INTRODUCTION
The broadband Internet and third-generation
(3G) cellular phone networks are rapidly expanding,
and advanced applications such as content
search, YouTube type image services, SNS, and
Second Life type cyber space applications have
been born and grown up day by day. The world
standards for next generation network (NGN)
are being proceeded in the International
Telecommunication Union — Telecommunication
Standardization Sector (ITU-T). The objectives
of NGN are to replace legacy telephone
networks using state-of-the-art IP network technologies,
and support triple-play and quadrupleplay
services over quality of service (QoS)
controllable IP networks. In Japan NTT started
NGN services at the end of March last year [2].
Telecommunications vendors are now concentrated
their resources on the deployment of the
NGN systems. Figure 1 shows an image of the
evolution of the commercial communication networks
in a few decades, and in the near future
two types of IP-based networks will coexist.
RESEARCH ON NWGN IN JAPAN
The systematic research on NWGN in Japan
started around 2006. In 2006 the Ministry of
Internal Affairs and Communication (MIC)
formed a committee to discuss future network
R&D issues. In the committee the author proposed
NWGN as a network beyond the Internet/
NGN, which are both based on IP, and
according to the recommendation of the committee,
an all-Japan NWGN Promotion Forum
(NWGN Forum) [6] was established in November
2007. Japanese industry cannot afford to
use their large amounts of resources for R&D
on NWGN at this moment due to the NGN
business deployment, so the National Institute
of Information and Communications Technology
(NICT) should be at the core of the NWGN
R&D together with the academic community.
NICT set the NWGN Strategic Section to guide
NWGN R&D in Japan, and started the AKARI
Project [4], which is a core research group to
study the NWGN architecture and protocols.
TECHNOLOGICAL ISSUES TO BE STUDIED
As shown in Fig. 3, clean-slate design for network
architecture needs three study approaches.
Allocation of various networking functions heavily
relies on the fundamental design concept.
The end-to-end concept in the Internet determines
the allocation of networking functions to
routers and end hosts. The concept means that a
network should be as stupid as possible and an
end host should be intelligent, but the current
Internet cannot keep this concept, as shown in
Fig. 5. In addition, it is difficult to support strong
security functions under the end-to-end concept,
so the AKARI Project is now working on a concept
for the allocation of networking functions
to meet the requirements.
DATA FORMAT TRANSPORTED
The Internet and NGN use an IP packet format,
and NWGN may also apply a packet format for
data, but there can be many other approaches to
be applied. We have to examine merits and
demerits for other formats such as flow and circuit/
path. Video streaming content may be transferred
by flow or circuit/path better than by
packet structure from the QoS or low delay performance
point of views. The AKARI Project is
studying the possibility of combining such data
formats, and an experimental photonic path/
packet combination switching system is being
built in NICT.
SEPARATION OF IDENTIFIER AND LOCATOR
The current IP address contains two different
functions, identification and location in a network.
In the ITU-T standardization of NGN, the
separation of these functions is being discussed.
NWGN may apply separation of the identifier
and locator, and the AKARI Project is studying
a separate structure.
NETWORK VIRTUALIZATION ANDOVERLAY NETWORK
A history of the technological advancement of a
computer can be seen from the viewpoint of virtualizing
a computer element. A computer user
can utilize a machine without any knowledge of
the precise physical structure of his/her computer.
But in the 1960s, a computer user needed to
know the real memory address to make a program
compute using the memory.
7.pdf (Size: 243.17 KB / Downloads: 60)
INTRODUCTION
The broadband Internet and third-generation
(3G) cellular phone networks are rapidly expanding,
and advanced applications such as content
search, YouTube type image services, SNS, and
Second Life type cyber space applications have
been born and grown up day by day. The world
standards for next generation network (NGN)
are being proceeded in the International
Telecommunication Union — Telecommunication
Standardization Sector (ITU-T). The objectives
of NGN are to replace legacy telephone
networks using state-of-the-art IP network technologies,
and support triple-play and quadrupleplay
services over quality of service (QoS)
controllable IP networks. In Japan NTT started
NGN services at the end of March last year [2].
Telecommunications vendors are now concentrated
their resources on the deployment of the
NGN systems. Figure 1 shows an image of the
evolution of the commercial communication networks
in a few decades, and in the near future
two types of IP-based networks will coexist.
RESEARCH ON NWGN IN JAPAN
The systematic research on NWGN in Japan
started around 2006. In 2006 the Ministry of
Internal Affairs and Communication (MIC)
formed a committee to discuss future network
R&D issues. In the committee the author proposed
NWGN as a network beyond the Internet/
NGN, which are both based on IP, and
according to the recommendation of the committee,
an all-Japan NWGN Promotion Forum
(NWGN Forum) [6] was established in November
2007. Japanese industry cannot afford to
use their large amounts of resources for R&D
on NWGN at this moment due to the NGN
business deployment, so the National Institute
of Information and Communications Technology
(NICT) should be at the core of the NWGN
R&D together with the academic community.
NICT set the NWGN Strategic Section to guide
NWGN R&D in Japan, and started the AKARI
Project [4], which is a core research group to
study the NWGN architecture and protocols.
TECHNOLOGICAL ISSUES TO BE STUDIED
As shown in Fig. 3, clean-slate design for network
architecture needs three study approaches.
Allocation of various networking functions heavily
relies on the fundamental design concept.
The end-to-end concept in the Internet determines
the allocation of networking functions to
routers and end hosts. The concept means that a
network should be as stupid as possible and an
end host should be intelligent, but the current
Internet cannot keep this concept, as shown in
Fig. 5. In addition, it is difficult to support strong
security functions under the end-to-end concept,
so the AKARI Project is now working on a concept
for the allocation of networking functions
to meet the requirements.
DATA FORMAT TRANSPORTED
The Internet and NGN use an IP packet format,
and NWGN may also apply a packet format for
data, but there can be many other approaches to
be applied. We have to examine merits and
demerits for other formats such as flow and circuit/
path. Video streaming content may be transferred
by flow or circuit/path better than by
packet structure from the QoS or low delay performance
point of views. The AKARI Project is
studying the possibility of combining such data
formats, and an experimental photonic path/
packet combination switching system is being
built in NICT.
SEPARATION OF IDENTIFIER AND LOCATOR
The current IP address contains two different
functions, identification and location in a network.
In the ITU-T standardization of NGN, the
separation of these functions is being discussed.
NWGN may apply separation of the identifier
and locator, and the AKARI Project is studying
a separate structure.
NETWORK VIRTUALIZATION ANDOVERLAY NETWORK
A history of the technological advancement of a
computer can be seen from the viewpoint of virtualizing
a computer element. A computer user
can utilize a machine without any knowledge of
the precise physical structure of his/her computer.
But in the 1960s, a computer user needed to
know the real memory address to make a program
compute using the memory.