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5g on Radio access

 

Radio access technology is one of the component
of 5g used to support many number of connected devices to meet high demand,to
provide high reliability communications and also to increase speed  and capacity. The key capabilities of 5g in
radio access is extending high frequency bands,,flexible spectrum usage, multi
antenna transmission and device to device communication,capacity,improve
throughput ,power consumption.The transformation taking palce with 5g is by
increasing  the existing frequency
bands  which is below 6GHz .though the
below 6GHz plays the important role in next generation there will be critical
in delivery of consistent and and multi Gbpsthroughputs.because the main
aspects of radio spectrum is abundance of available or lightly used spectrum.there
are two techniques used to improve signals and ability to reach each local user
is beamforming which is used to maximize signal quality and avoid interference
in surrounding  place and MIMO (multiple
input and multiple output)  uses advanced
signal processing to allow generate multiple radio waves to serve a single user
or multiple user to support each other rather than interfering it.

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                      5G ON RADIO ACCESS

 

The main Key technology features on
Radio access is to Extension to higher frequency bands and ultra-lean design.They
 provides high frequency connectivity on
Radio Access ..In the 5G era,these capabilities shall be enhanced to
accommodate massive traffic capacity and device connectivity while providing enhanced quality of user experience.

Evolution of
Radio-Access Technologies:

 

 A first direction for improving the service
provision and cost efficiency has been the evolution—from the second generation
(2G) to the third generation (3G) and the fourth generation (4G) or long-term
evolution (LTE)- advanced—of mobile/cellular communications. 3G and 4G
technologies have been the focus of the 3G Partnership Project (3GPP)
standardization . In parallel, there has been the introduction of various other
wireless local-/ metropolitan-/personal-area broadband systems, standardized in
the context of the IEEE . This evolution has primarily been the outcome of the
development of advanced radio-access
technologies (RATs), which led us
from the frequency/time division multiple access (FDMA/ TDMA) and wideband code
division multiple access (WCDMA) to the orthogonal frequency division multiple
access (OFDMA) schemes. Regarding cost efficiency, this direction is primarily
targeted to the improvement of resource use (spectrum and other radio
resources).

 

The
main requirements on 5G radio access are

1.Higher
System Capacity

2.Higher
data rate

3.Reduced
latency

4.Massive
device connectivity

5.Energy
saving and Cost reduction

6.Massive
number of devices

7.Very
high network energy performance

 

 

The
main aim of developing  5G on Radio
access is to provide high speed and
Traffic-Free network

 

 

 

                                    Flexible Radio Access on 5G Technology:

 

The
flexible centralization of RAN functionality has operation of   3GPPLTE 
RAN protocol stack .It may be limited by dependencies within the
protocol  stack. In the overview of the
3GPP LTE there are many centralized functionalities they are Detection and
Decoding, Link reliability protocol , scheduling and  Inter cell 
RRM ,segmentation or reassembly, RRC connection Handling, QOS Management
and Ciphering.

An alternative to decentralized concept
is to centralize Radio Access Network
(RAN) functionalities, First is so called centralized RAN proposes  to
reduce the functionality of BSs  to so
called Remote Radio Heads (RRH). This only performs analogue processing and
forward digital samples between RRH and
BBUS.

And actively working for future mobile
networks offers many advantages they are 1.reduction
in operational and capital expenditure that is by reducing the sizes, the sites
can be smaller and energy consumption can be reduced.  2. As
all BBUS are located in centralized location, maintenance also becomes very
easier. 3. Finally, current advances
in processor technology and virtualization have enabled by implementation of
Baseband processing on general – purposes Processors (GRPS).

The early deployment of C-RAN utilized BBUS composed of dedicated hardware such as Application – Specific
Integrated Circuits (ASICS), Field
Programmable Gate Arrays (FPGAS),
and Digital Signal Processors (DSPS).
The virtualization and the concept
of cloud computing is used in IT
industry can be facilitated. This 
simplifies maintenance, upgrades and organization it also introduces the
economy of scale and standardized hardware 
can be used for lowering capital expenditure.

CONCLUSION:

The flexibility offered by virtualized
cloud RAN implementation will also be the basis for flexible functional split.
This can be adapted in time and space
to optimally reflect the scenario in terms of traffic density and hardware utilization. Implementing RANAAs will
also used for more flexibility of RAN deployments under homogeneous and
heterogeneous . The RANAAs has been defined as flexible evolution for 4G
network such as 3GPPLTE which able to integrate
and support  multitude of radio access technology, services
and deployment strategies.

 

 

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