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Senin, 14 April 2014

5G talk

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Article 5G challenges, Article 5G features, Article 5G mobile, Article 5G requirements, Article 5G talk, Article Cloud RAN for 5G, Article cognitive radio, Article hetNEt 5G, Article IMT 2020, Article IOT, Article ITU 5G requirements, Article M2M, Article METIS NGMN, Article No more cells concept, Article PPDR, Article technology,

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5G talk

April 14, 2014: Living in that part of the world where 3G is not ubiquitous, talking 5G may sound futile to many but we need to be aware of where the world is heading. While 4G is still in infancy stage in the world, the unabated development of mobile technology is now moving towards fifth generation. As it is seen that a new generation mobile appears almost in a decade, 5G seems not coming before 2020. There is no any requirements set by the International Telecommunication Union (ITU) for the 5G mobile broadband, but some alliances and groups of vendors/carriers together with some universities are working to prepare a concrete view of what 5G is, to accelerate its adoption. NGMN (Next Generation Mobile Networks) and METIS 2020 (Mobile and Wireless communication enablers for twenty-twenty Information Society) are among those who have announced to lay the foundation for 5G. ITU itself has set 2015 as the year to have formulated its vision and present it in the World Radio Communication (WRC) conference 2015 that will provide the framework of International Mobile Telecommunication (IMT) for 2020 and beyond.
The growth of data usage is increasing significantly as it won't only be your mobile or tablet or computer that consumes internet in the coming 10 years but plethora of other devices (wearable to machines with unique address and censor) will require connection to create Internet of things (IOT). This IOT approach requires multi-fold increase in the internet speed plus the no of devices to connect also needs to increase significantly, along with the transition to new ip addressing scheme (IPv6). So it is expected that 1 Gbps data connection from 4G wont be enough that time, which requires new radio access technologies, of which some candidates are FBMC (Filter Bank Multi Carrier), NOMA (Non Orthogonal Multiple Access), Massive MIMO, Cognitive radio, C-RAN (Cloud RAN) and multi technology carrier aggregation. As the connection speed demand higher bandwidth, extremely high frequency (MMW) can be expected to use with very high spectral efficiency and low latency.
Another imminent issue will be massive deployment of small cells (with hetNet?) that increases capacity, coverage and require least planning with dynamic configuration of huge no. of cells by full fledged SON (Self Organizing Network or there may be "No more cell concept" with Cloud RAN. 5G is also known to radically change the network performance measurement metric from bits per sec to probably bits per joule or bits per 100 metre of coverage. So with 5G, spectrum efficiency is not only the only criteria but also demands energy efficiency to be considered together.
Better cell edge connectivity also needs to be ensured with IRC(Interference Rejection Combining), ICIC(Inter Cell Interference Coordination) , COMP (Coordinated multi point transmission and reception) like features for seamless connectivity. Cloud computing with 5G will not just be the present day cloud storage but it should encompass real time applications to handle the data from various devices.
With such fiber like speeds and massive no. of connections, 5G should support wide range of service scenarios like including M2M (Machine to Machine), D2D (Device to Device), PPDR (Public Protection Disaster Relief) communications.
But the challenges of 5G lies in the development of new RAT (from research that may take long) for low energy consuming, spectral efficient components to give out higher speeds (than 4G LTE) with low latency. Spectral requirement is another major issue to support the next generation mobile in an universal way, that follows spectral re-farming after setting up of the requirements. IPV6 management for the IOT demands configuration of such huge devices, privacy & safety of the devices. Dynamic Spectrum Access (DSA) is one of the key research to dynamically allocate the frequency resources cross technologies from different bands for dynamic reuse after spectrum sensing, that is only possible with cognitive radio but comes with additional challenges like wide band antennas, spectrum sensors and the security of Cognitive radio Network (CRN). Radio propagation in millimeter wave (MMW) even has this concern of low penetration and additional attenuation due to gases, rain in the environment; also making it ideal for densely packed communication.
As most of the issues talked above are under research and it will take years to get the next generation mobile broadband standard, I will be following the development quietly closely (from the journals) which I also did for its predecessor 4G but did not write that much. Lets wait and see how much I put in for future write-ups on 5G.



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