Today, world is enjoying with 4G with the benefits of Wi-MAX and Long-term Evolution (LTE), the question is what next? Development teams are working for next large innovations in wireless technology to achieve 5G goal by 2020 that can transmit 100 times more data. World is talking about ABC (always best connected) and ASR (Always sufficient rate) for the next generation wireless technology.
For a faster version of 4G we were using LTE-Advanced (LTE-A)as a mobile broadband integrated solution with direct local device-to-device communications to aid geographically available spectrum for channels above 20 MHz
5G will utilize IPv6 Neighbor Discovery Protocol (NDP)mechanism to create sub-networks to handle traffic locally and with the self-governing deployment mechanisms will make it more effective.
It is understood that Networks will become much heavier due to use of many more base stations, After the deployment in heterogeneous network (HetNet), this will include LTE-A, Wi-Fi and any future 5G Technologies .having this , the major task is to achieve best performance to handle 10,000 times much more traffic as compare to previous .
We want to just take an overview of possible network architecture commencing with several promising techniques in future 5G systems , research work is in progress to develop a system for possible techniques , following are few examples :
Non-orthogonal multiple access (NOMA)
A change from conventional telecommunication systems relying on interference free assumptions, a mechanism that can remove the resource allocation individuality and allows multiple users to share the same sub carrier without spreading redundancy , to achieve this workaround over Joint processing for the implementation at the receiver end to detect the users’ signals is being suggesting .
Massive multiple input and multiple output (MIMO)
As the next generation wireless networks need to accommodate 1000x more data traffic than current networks ; discussion is ongoing that what will be the role of MIMO , either it will be distributed or co-located . MIMO offers highly extent of freedom due to the usage of hundreds of antennas via single base station, it is a major breakthrough due to recent advancements in semiconductor technologies.
Full duplex (FD)
It is an important physical layer solutions to fulfill the promise of 5G by 2020 a spectrum crunch, It is expected that with deployment of FD systems, it will support all the existing half duplex mobile phones efficiently which will lead to a much more enhanced 5G system performance. This research is based on a global phenomenon that mobile communications always bandwidth resource hungry.
Millimeter wave communications
Will millimeter maximize the 5G communication? , it is a promising technology for future cellular networks as it operates in the 3-300GHz band.
Device-to-device (D2D) communication
Ideally consists of following architecture, having four designs:
- Device relay with operator controlled (DR-OC)
- Direct D2D communication with operator controlled (DC-OC)
- Device relay with device controlled (DR-DC)
- Direct D2D communication with device controlled (DC-DC)
D2D is important for unificationof telecom networks with mobile internet including internet of things (IoT).