22-07-2014, 03:03 PM
Multi-Bandwidth Data Path Design for 5G Wireless Mobile Internets
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Abstract
The 5th generation is envisaged to be a complete network for wireless mobile internet,
which has the capability to offer services for accommodating the application potential requirements
without suffering the quality. The ultimate goal of 5G is to design a real wireless world, that is free
from obstacles of the earlier generations. This requires an integration of networks. In this paper, we
propose the design of Multi-Bandwidth Data Path by integrating the current and future networks for
new network architecture of 5G real wireless world. We also present our proposed architecture and
results of the simulation
Introduction
Wireless mobile communication networks have
been evolved for generations. The first
generation (1G) wireless mobile communication
network is an analog system which is used for
public voice services with the speed up to
2.4kbps [1]. The second generation (2G) uses
the digital technology and network
infrastructure. In comparison with the first
generation, the second generation supports text
messaging [2]. Its success and the significant
growth of demand for online information via
the internet have prompted the development of
cellular wireless system with the improvement
on data connectivity, which is ultimately led to
the third generation systems (3G).
The 3G system refers to technology
standards for the next generation of mobile
communications systems. The main goal of
standardization efforts of 3G is to create a
universal infrastructure that is able to support
existing and future services [3]. This requires
the design of infrastructure that it can evolves
as technology changes, without compromising
the existing services on the existing networks.
Separation of access technology, transport
technology, service technology and user
application from each other make this
demanding requirement possible.
Literature Review
The 4G mobile wireless network is a research
area for the next generation wireless systems,
which can be supported by Bluetooth, WiFi
802.11 family, WiMax 802.16 family, cellular
and satellite networks as shown in Figure 2[20].
The Bluetooth is designed for personal area,
which can cover 10 meters. The WiFi 802.11
family is designed for local area, which can
cover 100 meters. The WiMax is designed for
metropolitan area, which can cover few
kilometers. The cellular networks are designed
for wide area, which can cover any where.
However, 4G integrates all access networks that
can provide total coverage, seamless roaming
and best connected services.
Multi-Bandwidth Data Path Design
CDMA development group (CDG) has issued
convergence architecture for 4G, which
combined pico cell, micro cell, macro cell and
global area shown in Figure 3. This architecture
shows that in pico-cell area, there are four
wireless network covered, in micro cell area,
there are three wireless network covered, in
macro cell area, there are two wireless network
covered at least. The problem arises for any
users at a certain place and time, it is one
network supply wireless services for them, the
others keep wireless network resources waste.
The 5G i
3.2 Multi-bandwidth Data Path Design
The function of bandwidth management is to
install and delete bandwidth monitor
components dynamically when it receives
indication messages from the mobile IP
protocol. The bandwidth management is
located at both ends of the sender and the
receiver. On each path, there is one bandwidth
monitor installed. The function of bandwidth
monitor is to monitor the available bandwidth
and calculate the proper transmission rates on
the corresponding path. The current existing
path is informed by the bandwidth management
after installing/deleting each bandwidth
monitor. The bandwidth monitor will provide
the rates information when it receives th
3.2.2 Bandwidth Selection
Bandwidth selection is located at the sender
side only. Since WLAN has integrated into
CDMA2000 networks, the message exchange is
between both networks i.e., from the sender to
the receiver. In this case, the bandwidth
selection will calculate and report the encoding
rates to the encoder so that it can adapt its
encoding rates accordingly after the selection of
bandwidth receive the bandwidth existence
information from the bandwidth management
and the rate information from the bandwidth
monitor. The bandwidth selection is also
responsible for assigning bandwidth encoded
IPv6 application
4.6 Throughput and available bandwidth
Throughput is very important aspect that
determines the quality of service of wireless
network for our proposed new scheme. Figure 7
shows the simulation result in which TCP/IP is
working on both CDMA-WLAN integrated
network with our proposed Multi-bandwidth
data path and CDMA2000 network. From
Figure 8, the throughput is increased when
TCP/IP working on integrated network because
available bandwidth is much higher then
TCP/IP working on CDMA2000 network alone.
Furthermore, TCP/IP working on the integrated
network can increase data rates more promptly
then it working on CDMA2000 network since
available bandwidth in WLAN network higher
then in CDMA2000 network
5.2 Numerical Results
Figure 10 shows the requirements of buffer size
in the integration of IPv6 and Multi-bandwidth.
As the number of internet reselection session
increased, the buffer size requirement is
increased. This is because in formula (4)
above, the buffer size is depending on three
factors: buffer time ( Bt
), bit rate (br
) and the
packet size ( Ps
). In the simulation system, the
buffer time depends on the distance of the two
nodes, but it is fixed, no any changes. The
packet size ( Ps
) should be same in whole
simulation. Thus, the buffer size ( Bs
) depends
on bit rates (br
). On the other hand, Figure 10
also shows that the buffer requirements are
same whatever with bandwidth reselection or
without bandwidth reselection. This is because
that there are same numbers of active data
sessions applying for buffer spaces in both
cases.
Conclusion and future work
In this paper, we proposed Multi-bandwidth
data path scheme for 5G real wireless world.
Data requests will be controlled by PCF
(Packets Control Function) in the CDMA2000
network and data reply will be controlled by
PDIF (Packet Data Interworking Function) in
WLAN. Data traffic is routed through PDSN
from CDMA2000 network to WLAN network.
The Multi-bandwidth data path scheme has
been defined to do bandwidth reselection for
rerouting so that all network resources can be
used efficiently.
The new Multi-bandwidth data path scheme
does not consider issues such as congestion
relief, re-negotiated QoS, or the movement
pattern of the mobile node. In the future, there
is a need to develop a new detection algorithm
that can support the broad level of network
integration promised by the 5G wireless system.