4G Definition - What comes after 4G?

4G Definition -  It is a successor of 3 g. it provides mobile ultra broad band internet access. This technology uses the packet switching in replacement to circuit switching which is being used in 3g and IP ( Internet protocol) based telephony. This technology uses OFDMA multicarrier transmission and other frequency domain equilisation(FDE) schemes, making it possible to transmit very high bit rate. This bit rate is further improved by using smart antennas having MIMO technology.

WHAT COMES AFTER 4G?

IMT Advanced is the prototype for what 5g mobile broadband would be.. it will offer a max downloading speed of 1 gbps that means you will be able to download 720 tv episodes in  90 sec or less. 5g IMT advanced is expecting to be faster then 4g LTE and WI-max. IMT advanced technologies will be able to allow more connections at individual cellular hubs, but it will facilate seamless handoffs while moving from one hub to another.

SYSTEM ARCHITECTURE EVOLUTION

It has an all IP architecture with separate control and user traffic.

Components - SAE Core/ evolved packet core(EPC)—it is similar to GPRS network seving mobility management and serving gateway.                

MME (Mobile Management Entity) :  it is the control node of the LTE acess networks. It is responsible for idle mode user equipment (UE) tracking nad paging procedures including retransmissions. It provides the mobility between LTE and 2g/3g users.

SGW (Serving Gateways) : it serves and routes packets between LTE and other 3GPP technologies.  For idle state UE’s it terminates the downlink path and triggers paging when downlink data arrives for the user equipment.

PGW (PDN gateway) : it provides  gateway between user equipment and external packet data networks.

HSS (Home subscriber server) : the HSS contains user related and subscription based  related information. This basically deals with mobility management , call and session information.

ANDSF (Acess Network Discovery and selection function) : it provides information to user equipment about connectivity between 3GPP and non 3GPP services. Non 3FPP sevices are wi-fi networks.

EPDG (evolved packet data gateway) : its main function is basically security of data.