FIVE exchanging multiple information flows through several possible sets

  FIVE DISRUPTIVE TECHNOLOGY DIRECTIONS FOR 5GABSTRACT:  New research directions will cause changes in 5th generation (5G)networks. This paper describes five technologies that could lead to disruptive design changes: Device-centric architectures,Millimeter Wave.Massive-MIMO.Smarter devices.Native support to machine-2-machine.INTRODUCTION:    This paper focuses on disruptive technologies and their implications for 5G.We classify the impact of new technologies, Minor changes at both the node and the architectural level.Network nodes design disruptive changes.System architecture disruptive changes.Impact at both the node and the architecture levels caused by disruptive changes.DEVICE-CENTRIC ARCHITECTURES :        In this section a device obtains service by establishing a downlink and an uplink connection, carrying both control and data traffic, with the base station commanding the cell where the device is located.cell-centric architecture should evolve into a device-centricone.   Device should be able to communicate by exchanging multiple information flows through several possible sets of heterogeneous nodes. In other words, the set of network nodes providing connectivity to a given device and the functions of these nodes in a particular communication session should be tailored to that specific device and session.II.MILLIMETER WAVE COMMUNICATION:Microwave cellular systems contains little spectrum around 600 MHz.There are two ways to gain access to more microwave spectrum: To repurpose or refarm spectrum.  To share spectrum utilizing.          *Doubling of the current cellular bandwidth is the best-case scenario at microwave frequencies.         * Propagation is not an insurmountable challenge      * Sensitivity to blockages is the difference between microwave and Mmware frequencies.     * Antenna arrays are a key feature in mmWave systems.MmWave systems also have distinct hardware constraints.               MmWave is a potentially disruptive technology for 5G.mmWave requires radical changes in the system, as it has a strong impact in both the component and the architecture designs.III.MASSIVE MIMO:           Massive MIMO is a form of multiuser MIMO in which the number of antennas at the base station is much larger than the number of devices. This feature renders the channels to the different devices .And it also smoothens out frequency dependencies in the channel.At a node level, it is a scalable technology. This is in contrast with 4G, which, in many respects, is not scalable:.n further cases it is not feasible because of         (i) the limited space for bulkyazimuthally-directive antennas, and         (ii) the unavoidable angle spread of the propagation             Single-user MIMO consists of  limited number of antennas that can be able to fit into certain mobile devices. There is almost no limit on base station antennas in massive-MIMO.It allows new deployments and architectures. We can perform direct replacement of macro base stations with arrays of low-gain resonant antennas, other deployments are possible.             MIMO for 5G is a major movement in system and component design. To show these major changes, massive-MIMO person should do further work to solve the challenges described above.IV.SMARTER DEVICES:           In this section, we discuss some of the possibilities that can be unleashed by allowing the devices to play a more active role and, thereafter, how 5G’s design should account for an increase indevice smartness.        We focus on three different examples of technologies  D2D local caching advanced interference rejection.1.D2D:-       D2D has the potential of handling local communication more efficiently, local highdata-rate exchanges could also be handled by other radio access technologies such as Bluetooth or Wi-Fidirect. 2.LOCAL CACHING:-           Caching massive amounts of data at the edge of the wireline network, right before the wireless hop, only applies to delay-tolerant traffic.It is easy to envision mobile devices with truly vast amounts of memory.It is clearly inefficient to transmit suchcontent via unicast. We hence see local caching as an important alternative, both at the radio access networkedge and at the mobile devices .3.ADVANCED INTERFERENCE REJECTION:-          In this section we mainly focuses on analyzing the implications of smarter devices at a component level.V.NATIVE SUPPORT FOR M2M COMMUNICATION:     Wireless communication is becoming a commodity, It is giving rise to a large class of emerging services with new types of requirements.We point to a few representative such requirements, ! A massive number of connected devices.Systems typically operate with, atmost, a few hundred devices per base station, some M2M services might require over 104connected devices. ! Very high link reliability.  As the systems transition from wireline to wireless, it becomes necessary for thewireless link to be reliably operational virtually all the time.! Low latency and real-time operation. This is the most important requirement than the both described above, as it demands that data be transferred reliably within a given time interval. Native support of M2M in 5G requires radicalchanges at both the node and the architecture level.CONCLUSION:        We conclude by saying that we has discussed five disruptive research directions in this paper that could lead to fundamental changes in the design of cellular networks. We have focused on technologies that could lead to both architectural and component design changes. It is likely that a suite of these solutions will form the basis of 5G.                                                                            BY,M.POOVARASI(1506124)R.SHRUTHI(1506130)